It is impossible to remove the Marked as Final status.

Name: It is impossible to remove the Marked as Final status.
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The Marked as Final status in documents (like those in Microsoft Word, Excel, or PowerPoint) can be removed by going to the File menu, selecting Info, choosing Protect Document, and then clicking on Mark as Final again to toggle off the status. This allows the document to be edited again.

It Is Impossible to Remove the Marked as Final Status