Fold all

`Alt` + `0`

All hotkeys for Ace Editor

Line operations Remove line	`Ctrl` + `D`
Line operations Copy lines down	`Alt` + `↑ Shift` + `↓`
Line operations Copy lines up	`Alt` + `↑ Shift` + `↑`
Line operations Move lines down	`Alt` + `↓`
Line operations Move lines up	`Alt` + `↑`
Line operations Remove to line end	`Alt` + `Del`
Line operations Remove to linestart	`Alt` + `⬅ Backspace`
Line operations Remove word left	`Ctrl` + `⬅ Backspace`
Line operations Remove word right	`Ctrl` + `Del`
Selection Select all	`Ctrl` + `A`
Selection Select left	`↑ Shift` + `←`
Selection Select right	`↑ Shift` + `→`
Selection Select word left	`Ctrl` + `↑ Shift` + `←`
Selection Select word right	`Ctrl` + `↑ Shift` + `→`
Selection Select line start	`↑ Shift` + `Home`
Selection Select line end	`↑ Shift` + `End`
Selection Select to line end	`Alt` + `↑ Shift` + `→`
Selection Select to line start	`Alt` + `↑ Shift` + `←`
Selection Select up	`↑ Shift` + `↑`
Selection Select down	`↑ Shift` + `↓`
Selection Select page up	`Shift` + `Page Up`
Selection Select page down	`Shift` + `Page Down`
Selection Select to start	`Ctrl` + `↑ Shift` + `Home`
Selection Select to end	`Ctrl` + `↑ Shift` + `End`
Selection Duplicate selection	`Ctrl` + `↑ Shift` + `D`
Selection Select to matching bracket	`Ctrl` + `↑ Shift` + `P`
Multicursor Add multi-cursor above	`Ctrl` + `Alt` + `↑`
Multicursor Add multi-cursor below	`Ctrl` + `Alt` + `↓`
Multicursor Add next occurrence to multi-selection	`Ctrl` + `Alt` + `→`
Multicursor Add previous occurrence to multi-selection	`Ctrl` + `Alt` + `←`
Multicursor Move multicursor from current line to the line above	`Ctrl` + `Alt` + `↑ Shift` + `↑`
Multicursor Move multicursor from current line to the line below	`Ctrl` + `Alt` + `↑ Shift` + `↓`
Multicursor Remove current occurrence from multi-selection and move to next	`Ctrl` + `Alt` + `↑ Shift` + `→`
Multicursor Remove current occurrence from multi-selection and move to previous	`Ctrl` + `Alt` + `↑ Shift` + `←`
Multicursor Select all from multi-selection	`Ctrl` + `↑ Shift` + `L`
Go to Go to left	`←`
Go to Go to right	`→`
Go to Go to word left	`Ctrl` + `←`
Go to Go to word right	`Ctrl` + `→`
Go to Go line up	`↑`
Go to Go line down	`↓`
Go to Go to line start	`Alt` + `←`
Go to Go to line start	`Home`
Go to Go to line end	`Alt` + `→`
Go to Go to line end	`End`
Go to Go to page up	`Page Up`
Go to Go to page down	`Page Down`
Go to Go to start	`Ctrl` + `Home`
Go to Go to end	`Ctrl` + `End`
Go to Go to line	`Ctrl` + `L`
Go to Scroll line down	`Ctrl` + `↓`
Go to Scroll line up	`Ctrl` + `↑`
Go to Go to matching bracket	`Ctrl` + `P`
Find / replace Find	`Ctrl` + `F`
Find / replace Replace	`Ctrl` + `H`
Find / replace Find next	`Ctrl` + `K`
Find / replace Find previous	`Ctrl` + `↑ Shift` + `K`
Folding Fold selection	`Alt` + `L`
Folding Fold selection	`Ctrl` + `F1`
Folding Unfold	`Alt` + `↑ Shift` + `L`
Folding Unfold	`Ctrl` + `↑ Shift` + `F1`
Folding Fold all	`Alt` + `0`
Folding Unfold all	`Alt` + `↑ Shift` + `0`
Other Indent	`⭾ Tab`
Other Outdent	`↑ Shift` + `⭾ Tab`
Other Undo	`Ctrl` + `Z`
Other Redo	`Ctrl` + `↑ Shift` + `Z`
Other Redo	`Ctrl` + `Y`
Other Show the settings menu	`Ctrl` + `,`
Other Toggle comment	`Ctrl` + `/`
Other Transpose letters	`Ctrl` + `T`
Other Enter full screen	`Ctrl` + `⤶ Enter`
Other Change to lower case	`Ctrl` + `↑ Shift` + `U`
Other Change to upper case	`Ctrl` + `U`
Other Overwrite	`Insert`
Other Macros replay	`Ctrl` + `↑ Shift` + `E`
Other Macros recording	`Ctrl` + `Alt` + `E`
Other Delete	`Del`