Constrain Aspect ratio when Crop tool is selected

`A`

All hotkeys for Photoshop Lightroom CC (MacOS)

Panel Shortcuts Show/ hide side panels	`Tab`
Panel Shortcuts Show/ hide all panels	`Shift` + `Tab`
Panel Shortcuts Show/ hide Toolbar	`T`
Panel Shortcuts Show/ hide Module Picker	`F5`
Panel Shortcuts Show/ hide Filmstrip	`F6`
Panel Shortcuts Show/ hide left panels	`F7`
Panel Shortcuts Show/ hide right panels	`F8`
Panel Shortcuts Toggle solo mode	`Option` +click a panel
Panel Shortcuts Open a new panel without closing soloed panel	`Shift` +click a panel
Panel Shortcuts Open/ close all panels	`Command` +click a panel
Panel Shortcuts Open/ close left panels, top to bottom	`Command` + `Ctrl` + `0` … `5`
Panel Shortcuts Open/close right panels, Library and Develop modules, top to bottom	`Command` + `0` … `8`
Panel Shortcuts Open/close right panels, Slideshow, Print, and Web modules, top to bottom	`Command` + `1` … `7`
Navigating Modules Go to Library module	`Command` + `Option` + `1`
Navigating Modules Go to Develop module	`Command` + `Option` + `2`
Navigating Modules Go to Slideshow module	`Command` + `Option` + `3`
Navigating Modules Go to Print module	`Command` + `Option` + `4`
Navigating Modules Go to Web module	`Command` + `Option` + `5`
Navigating Modules Go back/ go forward	`Command` + `Option` + `Arrow Left` / `Arrow Right`
Navigating Modules Go back to previous module	`Command` + `Option` + `Arrow Up`
Changing Views and Screen Modes Enter Library Loupe view	`E`
Changing Views and Screen Modes Enter Library Grid view	`G`
Changing Views and Screen Modes Enter Library Compare view	`C`
Changing Views and Screen Modes Enter Library Survey view	`N`
Changing Views and Screen Modes Open selected photo in Develop module	`D`
Changing Views and Screen Modes Cycle forward/ backward through Lights Out modes	`L` / `Shift` + `L`
Changing Views and Screen Modes Toggle Lights Dim mode	`Command` + `Shift` + `L`
Changing Views and Screen Modes Toggle Full screen mode	`F`
Changing Views and Screen Modes Previous screen mode	`Shift` + `F`
Changing Views and Screen Modes Toggle Screen Modes: Normal, Full screen, hide panels	`Command` + `Shift` + `F`
Changing Views and Screen Modes Go to Normal screen mode, exit Full screen	`Command` + `Option` + `F`
Changing Views and Screen Modes Cycle Info overlay	`I`
Changing Views and Screen Modes Show/ hide Info overlay	`Command` + `I`
Using Secondary Window Open secondary window	`Command` + `F11`
Using Secondary Window Enter Grid view	`Shift` + `G`
Using Secondary Window Enter normal Loupe view	`Shift` + `E`
Using Secondary Window Enter locked Loupe view	`Command` + `Shift` + `Enter`
Using Secondary Window Enter Compare view	`Shift` + `C`
Using Secondary Window Enter Survey view	`Shift` + `N`
Using Secondary Window Enter Slideshow view	`Command` + `Option` + `Shift` + `Enter`
Using Secondary Window Enter full-screen mode with secondary monitor	`Command` + `Shift` + `F11`
Using Secondary Window Show/ hide Filter bar	`Shift` + `\`
Using Secondary Window Zoom in/ zoom out	`Command` + `Shift` + `=` / `-`
Managing Photos and Catalogs Import photos from disk	`Command` + `Shift` + `I`
Managing Photos and Catalogs Open catalog	`Command` + `Shift` + `O`
Managing Photos and Catalogs Open Preferences	`Command` + `,`
Managing Photos and Catalogs Open Catalog Settings	`Command` + `Option` + `,`
Managing Photos and Catalogs Create new subfolder (segmented Tethered capture)	`Command` + `Shift` + `T`
Managing Photos and Catalogs Hide/show Tether capture bar	`Command` + `T`
Managing Photos and Catalogs Create a new folder in the Library module	`Command` + `Shift` + `N`
Managing Photos and Catalogs Create virtual copy (Library/ Develop module)	`Command` + `‘`
Managing Photos and Catalogs Show in Finder (Library/ Develop module)	`Command` + `R`
Managing Photos and Catalogs Go to next/ previous photo in Filmstrip	`Arrow Right` / `Arrow Left`
Managing Photos and Catalogs Select multiple folders or collections	`Shift` +click / `Command` +click
Managing Photos and Catalogs Rename photo (in Library module)	`F2`
Managing Photos and Catalogs Delete selected photo(s)	`Delete`
Managing Photos and Catalogs Remove selected photo(s) from catalog	`Option` + `Delete`
Managing Photos and Catalogs Delete selected photo(s) and move to Recycling Bin (Windows) or Trash (Mac OS)	`Command` + `Option` + `Shift` + `Delete`
Managing Photos and Catalogs Delete rejected photo(s)	`Command` + `Delete`
Managing Photos and Catalogs Edit in Photoshop	`Command` + `E`
Managing Photos and Catalogs Edit in other Editor	`Command` + `Option` + `E`
Managing Photos and Catalogs Export selected photo(s)	`Command` + `Shift` + `E`
Managing Photos and Catalogs Export with previous settings	`Command` + `Option` + `Shift` + `E`
Managing Photos and Catalogs Open plug-in manager	`Command` + `Option` + `Shift` + , (comma)
Managing Photos and Catalogs Print selected photo	`Command` + `P`
Managing Photos and Catalogs Open Page Setup dialog box	`Command` + `Shift` + `P`
Comparing Photos in the Library Module Switch to Loupe view	`E` / `Enter`
Comparing Photos in the Library Module Switch to Grid view	`G` / `Esc`
Comparing Photos in the Library Module Switch to Compare view	`C`
Comparing Photos in the Library Module Switch to Survey view	`N`
Comparing Photos in the Library Module Switch from Grid to Loupe view	`Space` / `E`
Comparing Photos in the Library Module Swap select and candidate photos in Compare view	`Arrow Down`
Comparing Photos in the Library Module Make next photos select and candidate in Compare view	`Arrow Up`
Comparing Photos in the Library Module Toggle Zoom view	`Z`
Comparing Photos in the Library Module Zoom in/ zoom out in Loupe view	Command `=` / `-`
Comparing Photos in the Library Module Scroll up/ down zoomed photo in Loupe view	`Page Up` / `Page Down`
Comparing Photos in the Library Module Go to beginning/ end of Grid view	`Home` / `End`
Comparing Photos in the Library Module Play impromptu slide show	`Command` + `Enter`
Comparing Photos in the Library Module Rotate photo right/ left	`Command` + `]` / `]`
Comparing Photos in the Library Module Increase/ decrease Grid thumbnail size	`=` / `-`
Comparing Photos in the Library Module Scroll up/ down Grid thumbnails	`Page Up` / `Page Down`
Comparing Photos in the Library Module Toggle cell extras	`Command` + `Shift` + `H`
Comparing Photos in the Library Module Show/hide badges	`Command` + `Option` + `Shift` + `H`
Comparing Photos in the Library Module Cycle Grid views	`J`
Comparing Photos in the Library Module Open Library view options	`Command` + `J`
Comparing Photos in the Library Module Select multiple discrete photos	`Command` +click
Comparing Photos in the Library Module Select multiple contiguous photos	`Shift` +click
Comparing Photos in the Library Module Select all photos	`Command` + `A`
Comparing Photos in the Library Module Deselect all photos	`Command` + `D` / `Command` + `Shift` + `A`
Comparing Photos in the Library Module Select only active photo	`Command` + `Shift` + `D`
Comparing Photos in the Library Module Deselect active photo	`/`
Comparing Photos in the Library Module Add previous/next photo to selection	`Shift` + Left/ `Arrow Right`
Comparing Photos in the Library Module Select flagged photos	`Command` + `Option` + `A`
Comparing Photos in the Library Module Deselect unflagged photos	`Command` + `Option` + `Shift` + `D`
Comparing Photos in the Library Module Group into stack	`Command` + `G`
Comparing Photos in the Library Module Ungroup stack	`Command` + `Shift` + `G`
Comparing Photos in the Library Module Toggle stack	`S`
Comparing Photos in the Library Module Move to top of stack	`Shift` + `S`
Comparing Photos in the Library Module Move up/ down in stack	`Shift` + `]` / `]`
Rating and Filtering Photos Set star rating	`1` … `5`
Rating and Filtering Photos Set star rating and go to next photo	`Shift` + `1` … `5`
Rating and Filtering Photos Remove star rating	`0`
Rating and Filtering Photos Remove star rating and go to next photo	`Shift` + `0`
Rating and Filtering Photos Increase/decrease rating by one star	`]` / `]`
Rating and Filtering Photos Assign red label	`6`
Rating and Filtering Photos Assign yellow label	`7`
Rating and Filtering Photos Assign green label	`8`
Rating and Filtering Photos Assign blue label	`9`
Rating and Filtering Photos Assign color label and goto next photo	`Shift` + `6` … `9`
Rating and Filtering Photos Flag photo as Pick	`P`
Rating and Filtering Photos Flag photo as Pick and goto next photo	`Shift` + `P`
Rating and Filtering Photos Flag photo as reject	`X`
Rating and Filtering Photos Flag photo as reject and goto next photo	`Shift` + `X`
Rating and Filtering Photos Unflag photo	`U`
Rating and Filtering Photos Unflag photo and goto next photo	`Shift` + `U`
Rating and Filtering Photos Increase/ decrease flag status	`Command` + `Arrow Up` / `Arrow Down`
Rating and Filtering Photos Cycle flag settings	`‘`
Rating and Filtering Photos Refine photos	`Command` + `Option` + `R`
Rating and Filtering Photos Show/ hide Library Filter bar	`\`
Rating and Filtering Photos Open multiple filters in the Filter bar	`Shift` +click filter labels
Rating and Filtering Photos Toggle filters on/off	`Command` + `L`
Rating and Filtering Photos Find photo in the Library module	`Command` + `F`
Collections Create New collection in the Library module	`Command` + `N`
Collections Add to Quick Collection	`B`
Collections Add to Quick Collection and go to next photo	`Shift` + `B`
Collections Show Quick Collection	`Command` + `B`
Collections Save Quick Collection	`Command` + `Option` + `B`
Collections Clear Quick Collection	`Command` + `Shift` + `B`
Collections Set as target collection	`Command` + `Option` + `Shift` + `B`
Metadata and Keywords in Library Module Add Keywords	`Command` + `K`
Metadata and Keywords in Library Module Edit Keywords	`Command` + `Shift` + `K`
Metadata and Keywords in Library Module Set a Keyword shortcut	`Command` + `Option` + `Shift` + `K`
Metadata and Keywords in Library Module Add/ remove Keyword shortcut from selected photo	`Shift` + `K`
Metadata and Keywords in Library Module Enable painting	`Command` + `Option` + `K`
Metadata and Keywords in Library Module Add a keyword from a keyword set to selected photo	`Option` + `1` … `9`
Metadata and Keywords in Library Module Cycle forward through keyword sets	`Option` + `0`
Metadata and Keywords in Library Module Cycle backward through keyword sets	`Option` + `Shift` + `0`
Metadata and Keywords in Library Module Copy metadata	`Command` + `Option` + `Shift` + `C`
Metadata and Keywords in Library Module Paste metadata	`Command` + `Option` + `Shift` + `V`
Metadata and Keywords in Library Module Save metadata to file	`Command` + `S`
Metadata and Keywords in Library Module Open Spelling dialog box	`Command` + `:`
Metadata and Keywords in Library Module Check spelling	`Command` + `;`
Metadata and Keywords in Library Module Open Character palette	`Command` + `Option` + `T`
Develop Module Convert to grayscale	`V`
Develop Module Auto tone	`Command` + `U`
Develop Module Auto white balance	`Command` + `Shift` + `U`
Develop Module Edit in Photoshop	`Command` + `E`
Develop Module Copy Develop settings	`Command` + `Shift` + `C`
Develop Module Paste Develop settings	`Command` + `Shift` + `V`
Develop Module Paste settings from previous photo	`Command` + `Option` + `V`
Develop Module Copy After settings to Before	`Command` + `Option` + `Shift` + `Arrow Left`
Develop Module Copy Before settings to After	`Command` + `Option` + `Shift` + `Arrow Right`
Develop Module Swap Before and After settings	`Command` + `Option` + `Shift` + `Arrow Up`
Develop Module Increase/decrease selected slider in small increments	`[` + `]` / `-`
Develop Module Increase/decrease selected slider in larger increments	`Shift` + `[` + `]` / `-`
Develop Module Cycle forward/ backwards through Basic panel settings	`.` / `,`
Develop Module Reset a slider	Double-click slider name
Develop Module Reset a group of sliders	`Option` +click group name
Develop Module Reset all settings	`Command` + `Shift` + `R`
Develop Module Sync settings	`Command` + `Shift` + `S`
Develop Module Sync settings bypassing Synchronize Settings dialog box	`Command` + `Option` + `S`
Develop Module Toggle Auto Sync	`Command` +click Sync button
Develop Module Enable Auto Sync	`Command` + `Option` + `Shift` + `A`
Develop Module Match total exposures	`Command` + `Option` + `Shift` + `M`
Develop Module Select White Balance tool	`W`
Develop Module Select the Crop tool	`R`
Develop Module Constrain Aspect ratio when Crop tool is selected	`A`
Develop Module Crop to same Aspect ratio as previous crop	`Shift` + `A`
Develop Module Crop from center of photo	`Option` +drag
Develop Module Cycle Crop grid Overlay	`O`
Develop Module Cycle Crop grid overlay Orientation	`Shift` + `O`
Develop Module Switch crop between portrait and landscape orientation	`X`
Develop Module Reset crop	`Command` + `Option` + `R`
Develop Module Select the Spot Removal tool	`Q`
Develop Module Select the Adjustment Brush tool (from any module)	`K`
Develop Module Select the Graduated Filter tool	`M`
Develop Module Increase/ decrease brush size	`]` / `[`
Develop Module Increase/ decrease brush feathering	`Shift` + `]` / `[`
Develop Module Switch between local adjustment brush A and B	`/`
Develop Module Temporarily switch from brush A or B to Eraser	`Option` +drag
Develop Module Paint a horizontal or vertical line	`Shift` +drag
Develop Module Increase/decrease Amount	Drag adjustment pin right/left
Develop Module Show/ hide local adjustment pin	`H`
Develop Module Show/ hide local adjustment mask Overlay	`O`
Develop Module Cycle local adjustment mask Overlay colors	`Shift` + `O`
Develop Module Select targeted Adjustment tool to apply Tone Curve	`Command` + `Option` + `Shift` + `T`
Develop Module Select Targeted Adjustment tool to apply Hue	`Command` + `Option` + `Shift` + `H`
Develop Module Select Targeted Adjustment tool to apply Saturation	`Command` + `Option` + `Shift` + `S`
Develop Module Select Targeted Adjustment tool to apply Luminance	`Command` + `Option` + `Shift` + `L`
Develop Module Select Targeted Adjustment tool to apply Grayscale Mix	`Command` + `Option` + `Shift` + `G`
Develop Module Deselect Targeted Adjustment tool	`Command` + `Option` + `Shift` + `N`
Develop Module Show clipping	`J`
Develop Module Rotate photo right/ left	`Command` + `]` / `[`
Develop Module Toggle between Loupe and 1:1 Zoom preview	`Space` / `Z`
Develop Module Zoom in / zoom out	`Command` + `=` / `-`
Develop Module Play impromptu slide show	`Command` + `Enter`
Develop Module View Before and After left/ right	`Y`
Develop Module View Before and After top/ bottom	`Option` + `Y`
Develop Module View Before and After in a split screen	`Shift` + `Y`
Develop Module View Before only	`\`
Develop Module Create a new snapshot	`Command` + `N`
Develop Module Create a new preset	`Command` + `Shift` + `N`
Develop Module Create a new preset folder	`Command` + `Option` + `N`
Develop Module Open Develop view options	`Command` + `J`
Slideshow Module Play slide show	`Enter`
Slideshow Module Play impromptu slide show	`Command` + `Enter`
Slideshow Module Pause slide show	`Space`
Slideshow Module Preview slide show	`Option` + `Enter`
Slideshow Module End slide show	`Esc`
Slideshow Module Go to next slide	`Arrow Right`
Slideshow Module Go to previous slide	`Arrow Left`
Slideshow Module Rotate photo right/ left	`Command` + `]` / `[`
Slideshow Module Show/ hide guides	`Command` + `Shift` + `H`
Slideshow Module Export PDF slide show	`Command` + `J`
Slideshow Module Export JPEG slide show	`Command` + `Shift` + `J`
Slideshow Module Export video slide show	`Command` + `Option` + `J`
Slideshow Module Create a new slide show template	`Command` + `N`
Slideshow Module Create a new slide show template folder	`Command` + `Shift` + `N`
Slideshow Module Save slide show settings	`Command` + `S`
Print Module Print	`Command` + `P`
Print Module Print one copy	`Command` + `Option` + `P`
Print Module Open Page Setup dialog box	`Command` + `Shift` + `P`
Print Module Open Print Settings dialog box	`Command` + `Option` + `Shift` + `P`
Print Module Go to first page/ last page	`Command` + `Shift` + `Arrow Left` / `Arrow Right`
Print Module Go to previous/ next page	`Command` + `Arrow Left` / `Arrow Right`
Print Module Show/ hide guides	`Command` + `Shift` + `H`
Print Module Show/ hide rulers	`Command` + `R`
Print Module Show/ hide page bleed	`Command` + `Shift` + `J`
Print Module Show/ hide Margins and gutters	`Command` + `Shift` + `M`
Print Module Show/ hide image cells	`Command` + `Shift` + `K`
Print Module Show/ hide dimensions	`Command` + `Shift` + `U`
Print Module Play impromptu slide show	`Command` + `Enter`
Print Module Rotate photo right/ left	`Command` + `]` / `[`
Print Module Create a new print template	`Command` + `N`
Print Module Create a new print template folder	`Command` + `Shift` + `N`
Print Module Save print settings	`Command` + `S`
Web Module Reload web gallery	`Command` + `R`
Web Module Preview in browser	`Command` + `Option` + `P`
Web Module Play impromptu slide show	`Command` + `Enter`
Web Module Export web gallery	`Command` + `J`
Web Module Create a new web gallery template	`Command` + `N`
Web Module Create a new web gallery template folder	`Command` + `Shift` + `N`
Web Module Save web gallery settings	`Command` + `S`
Help Display current module shortcuts	`Command` + `/`
Help Hide current module shortcuts	Click
Help Go to current module Help	`Command` + `Option` + `Shift` + `/`
Help Open Community Help	`F1`