New line in formatted labels

`↑ Shift` + `⤶ Enter`

All hotkeys for draw.io

Labels Insert text or add an edge label	`Mouse double click`
General (Click on the blue arrow) Connect and clone shape	`Mouse left click`
General (Click on symbol / hold, drag) Rotate shape or text	`Mouse movement`
Document Save	`Ctrl` + `S`
Document Undo	`Ctrl` + `Z`
Document Redo (Windows)	`Ctrl` + `Y`
Navigate & view Zoom in / out	`Ctrl` + `Mouse wheel up and down`
Navigate & view Zoom in / out	`Alt` + `Mouse wheel up and down`
Navigate & view Zoom in / out	`Ctrl` + `+`
Navigate & view Zoom in / out	`Ctrl` + `-`
Navigate & view Pan canvas	`Space`
Navigate & view Pan canvas	`Mouse movement`
Navigate & view Reset view	`Ctrl` + `H`
Navigate & view Fit window	`Ctrl` + `↑ Shift` + `H`
Navigate & view Fit page	`Ctrl` + `J`
Navigate & view Fit two pages	`Ctrl` + `↑ Shift` + `J`
Navigate & view Custom zoom	`Ctrl` + `0`
Navigate & view Create / remove space	`Ctrl` + `↑ Shift` + `Mouse movement`
Navigate & view Click connection to disable connections	`Ctrl` + `↑ Shift`
Navigate & view Home	`Home`
Navigate & view Refresh	`End`
Canvas Copy	`Ctrl` + `C`
Canvas Cut	`Ctrl` + `X`
Canvas Paste	`Ctrl` + `V`
Duplicate and delete Duplicate	`Ctrl` + `D`
Labels Start editing label of selected cell	`⤶ Enter`
Canvas Delete selected cells	`⬅ Backspace`
Canvas Delete selected cells	`Del`
Canvas Delete with connections	`Ctrl` + `Del`
Document Ignore handles under the mouse	`↑ Shift`
Resize and move Hold to resize centered	`↑ Shift` + `Ctrl`
Resize and move Resize cell (grid size)	`Ctrl` + `↑ Shift` + `← ↑ → ↓`
Resize and move Move cell (grid size)	`↑ Shift` + `← ↑ → ↓`
Labels Stop editing and apply value	`⭾ Tab`
Selecting Select previous	`↑ Shift` + `⭾ Tab`
Canvas Disconnect edge	`↑ Shift` + `Mouse movement`
Selecting Remove from selection	`Alt` + `↑ Shift` + `Mouse movement`
Selecting multiple objects Select all	`Ctrl` + `A`
Selecting Select none	`Ctrl` + `↑ Shift` + `A`
Selecting Select cell below	`Alt` + `Mouse left click`
Tools Context menu	`Ctrl` + `Mouse left click`
Selecting multiple objects Toggle selection state	`↑ Shift` + `Mouse left click`
Selecting multiple objects Select vertices	`Ctrl` + `↑ Shift` + `I`
Selecting multiple objects Select edges	`Ctrl` + `↑ Shift` + `E`
Labels New line in formatted labels	`↑ Shift` + `⤶ Enter`
Labels Cancel editing	`↑ Shift` + `Esc`
Labels Stop editing and apply value	`F2`
Document Cancel action	`Esc`
Labels Toggle bold on selected text	`Ctrl` + `B`
Labels Toggle italic on selected text	`Ctrl` + `I`
Labels Toggle underline on selected text	`Ctrl` + `U`
Labels Superscript on selected text	`Ctrl` + `.`
Labels Subscript on selected text	`Ctrl` + `,`
Tools Toggle layers window	`Ctrl` + `↑ Shift` + `L`
Tools Toggle outline window	`Ctrl` + `↑ Shift` + `O`
Tools Edit metadata	`Ctrl` + `M`
Tools Toggle format panel	`Ctrl` + `↑ Shift` + `P`
Tools Edit vertex geometry	`Ctrl` + `↑ Shift` + `M`
Tools Context menu	`Mouse right click`
Tools About	`F1`
Canvas Group	`Ctrl` + `G`
Canvas Ungroup	`Ctrl` + `↑ Shift` + `U`
Canvas Lock / unlock	`Ctrl` + `L`
Canvas Edit link	`Alt` + `↑ Shift` + `L`
Canvas Duplicate	`Ctrl` + `⤶ Enter`
Canvas Duplicate	`D Ctrl` + `⤶ Enter`
Canvas Turn / rotate 90° clockwise	`Ctrl` + `R`
Canvas Collapse container	`Ctrl` + `Home`
Canvas Expand container	`Ctrl` + `End`
Canvas Exit group	`Ctrl` + `↑ Shift` + `Home`
Canvas Send to back	`Ctrl` + `↑ Shift` + `B`
Canvas Bring to front	`Ctrl` + `↑ Shift` + `F`
Canvas Clear waypoints	`Alt` + `↑ Shift` + `C`
Canvas Edit tool tip	`Alt` + `↑ Shift` + `T`
Canvas Autosize	`Ctrl` + `↑ Shift` + `Y`
Canvas Clone cell	`Ctrl` + `Mouse movement`
Canvas (While connecting) Connect to a fixed point	`Alt`
Document Save as	`Ctrl` + `↑ Shift` + `S`
Document Connection arrows	`Alt` + `↑ Shift` + `A`
Document Connection points	`Alt` + `↑ Shift` + `P`
Document Toggle grid	`Ctrl` + `↑ Shift` + `G`
Document Print	`Ctrl` + `P`
Document Redo (Linux, Mac)	`Ctrl` + `↑ Shift` + `Z`
Document Insert text	`Ctrl` + `↑ Shift` + `X`
Document Insert rectangle	`Ctrl` + `K`
Document Insert ellipse	`Ctrl` + `↑ Shift` + `K`
Document Force rubberband	`Alt` + `Mouse movement`
Styles Clear default style	`Ctrl` + `↑ Shift` + `R`
Styles Edit style	`Ctrl` + `E`
Styles Set as default style	`Ctrl` + `↑ Shift` + `D`
Styles Copy style	`Ctrl` + `↑ Shift` + `C`
Styles Paste style	`Ctrl` + `↑ Shift` + `V`