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For AI agents: a documentation index is at /llms.txt. Every page is also available as markdown, just append .md to the URL.

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Overview

Timeline settings holds the options that apply to the whole clip rather than a single layer. Open it with the gear button at the right end of the timeline toolbar in the editor.

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What You Can Change

After you change the aspect ratio, review each segment. Framing that worked in landscape may need adjusting in portrait. See How to change the orientation of AI-generated clips.

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Reset The Timeline

Reset Timeline puts the clip back to the last version you saved. Every edit you’ve made since then, including clips, captions, style, and layout, is lost, and you can’t undo the reset.
  1. Click the gear button to open Timeline settings.
  2. Click Reset Timeline.
  3. Confirm in the dialog.
Only reset when you want to throw away all unsaved changes. To undo a single step, use Undo in the toolbar or press ⌘Z (Ctrl+Z on Windows).