If you remove hidden data from a presentation,you may not be able to restore it with the Undo command.

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Quizplus · Accepted Answer

When you remove hidden data from a presentation, it is permanently deleted and cannot be restored with the Undo command. It is recommended that you save a copy of the presentation before removing any hidden data to ensure that you have a backup in case you need to restore any information later.

If You Remove Hidden Data from a Presentation,you May Not