Select all clips. To select all clips in the timeline, first click anywhere in the timeline. To select all clips in the browser, first click anywhere in the browser

`⌘ Cmd` + `A`

All hotkeys for Apple iMovie

Get information Open the iMovie Help menu	`↑ Shift` + `⌘ Cmd` + `?`
Import and export Import media	`⌘ Cmd` + `I`
Import and export Share the selection to iMovie Theater	`⌘ Cmd` + `E`
Playing video Play video beginning from the frame beneath the playhead or skimmer	`Space`
Playing video Play the selection	`/`
Playing video Play the selected event, clip, or project from the beginning	`\`
Playing video Move the playhead one frame forward	`→`
Playing video Move the playhead one frame backward	`←`
Playing video When playing a clip in the browser, jump forward to the next clip	`↓`
Playing video When playing a clip in the timeline, jump to the beginning of the current clip, or jump to the previous clip if the playhead is near the beginning of the current clip	`↑`
iMovie window Play the selected item full screen	`↑ Shift` + `⌘ Cmd` + `F`
Playing video Exit full screen view	`Esc`
Playing video Loop playback	`⌘ Cmd` + `L`
Playing video Show or hide clip information when skimming in the browser	`Control` + `Y`
Managing projects and events Create a new movie project	`⌘ Cmd` + `N`
Managing projects and events Move to Trash: Moves the selected clip, movie, trailer, or event to the Trash. If only part of a clip is selected, the entire clip is moved to the Trash	`⌘ Cmd` + `Del`
Managing projects and events Open iMovie preferences	`⌘ Cmd` + `,`
Selecting and editing video Select all clips. To select all clips in the timeline, first click anywhere in the timeline. To select all clips in the browser, first click anywhere in the browser	`⌘ Cmd` + `A`
Selecting and editing video Select an entire clip	`X`
Selecting and editing video (hold down R and drag) Select part of a clip	`R` + `Mouse movement`
Selecting and editing video Deselect all clips	`↑ Shift` + `⌘ Cmd` + `A`
Selecting and editing video Add the selection to the movie	`E`
Selecting and editing video Connect the selection to the clip at the playhead position	`Q`
Selecting and editing video Insert the selection in the movie at the playhead position	`W`
Selecting and editing video Automatically improve the video and audio quality of the selected clip	`↑ Shift` + `⌘ Cmd` + `E`
Editing text Cut the selected text	`⌘ Cmd` + `X`
Editing text Copy the selected text	`⌘ Cmd` + `C`
Selecting and editing video Open or close the precision editor	`⌘ Cmd` + `/`
Selecting and editing video Trim a clip in the timeline to the selected range	`⌥ Option` + `/`
Selecting and editing video Divide a clip at the playhead position	`⌘ Cmd` + `B`
Selecting and editing video Reset speed adjustments	`⌥ Option` + `↑ Shift` + `R`
Selecting and editing video Paste all adjustments	`⌥ Option` + `⌘ Cmd` + `V`
Selecting and editing video Paste color correction adjustments	`⌥ Option` + `⌘ Cmd` + `C`
Selecting and editing video Paste crop adjustments	`⌥ Option` + `⌘ Cmd` + `R`
Selecting and editing video Paste volume adjustments	`⌥ Option` + `⌘ Cmd` + `A`
Selecting and editing video Paste the video effect	`⌥ Option` + `⌘ Cmd` + `L`
Selecting and editing video Paste the audio effect	`⌥ Option` + `⌘ Cmd` + `O`
Selecting and editing video Paste speed adjustments	`⌥ Option` + `⌘ Cmd` + `S`
Selecting and editing video Paste video overlay settings. Pastes adjustments, depending on which type of video is selected	`⌥ Option` + `⌘ Cmd` + `U`
Selecting and editing video Paste the map style	`⌥ Option` + `⌘ Cmd` + `M`
Selecting and editing video Rate the selection as favorite	`F`
Selecting and editing video Unmark selected frames	`U`
Selecting and editing video Rate the selection as rejected, or delete the selection from the timeline	`Del`
Selecting and editing video Open or close the clip trimmer when a clip is selected	`⌘ Cmd` + `\`
Working with audio Open voiceover controls in the viewer	`V`
Working with audio Turn on or silence audio while skimming video	`↑ Shift` + `S`
Working with audio Mute audio in a clip	`↑ Shift` + `⌘ Cmd` + `M`
Working with audio Detach audio from a clip	`⌥ Option` + `⌘ Cmd` + `B`
Working with audio Undo the last action	`⌘ Cmd` + `Z`
Working with audio Redo the last action	`↑ Shift` + `⌘ Cmd` + `Z`
Editing text Paste the copied text	`⌘ Cmd` + `V`
iMovie window Minimize the iMovie window	`⌘ Cmd` + `M`
iMovie window Go to Library view (the default main window view)	`1`
iMovie window Go to Projects view	`2`
iMovie window Go to iMovie Theater	`3`
iMovie window Show or hide the Libraries list	`↑ Shift` + `⌘ Cmd` + `1`
iMovie window Show my media in the browser	`⌘ Cmd` + `1`
iMovie window Show audio in the browser	`⌘ Cmd` + `2`
iMovie window Show titles in the browser	`⌘ Cmd` + `3`
iMovie window Show maps and backgrounds in the browser	`⌘ Cmd` + `4`
iMovie window Show sound effects in the browser	`⌘ Cmd` + `5`
iMovie window Show transitions in the browser	`⌘ Cmd` + `6`