Hi @bunny1
You can delete a version of a proof.
To do this:
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Go to the project, task, or issue that contains the proof, then select Documents.Find the proof you need.
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In the Version area in the Summary, click the version, then click Delete in the drop-down list that appears. The Delete option is visible only if there are at least two versions.
Link to WF documentation here
I hope that is helpful for you.