After making changes, you'll see a Git commit window in the capsule's timeline:

You can click the 'uncommitted change(s)' link to see a new window detailing these changes:

If you wish to discard this change, you can either unselect the file (or choose Deselect All'), and commit only those changes that remain; or you can click the 'Discard all changes' button at the bottom of the timeline:

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