What revert does
Revert cancels one specific past change from the history, wherever it sits in the list, and leaves everything that came after it untouched.
How it differs from undo
This is different from Undo, which only peels back your most recent change. Revert lets you reach into the list and cancel a single entry on its own. That is what makes the history safe to use when several people are editing at once: you can take back one change without unwinding everyone else's work.
Reverting an entry
Open the Activity Panel and find the change you want to cancel.
Hover over that entry in the list.
Click its Revert button.
The reverted entry is removed from the list rather than adding a new "undo" line, which keeps the history tidy and easy to read.
Revert is hidden on locked tabs and for people who are only viewing the diagram.
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