Please give the following information:
- The version of your PowerPoint.
You can check it via PowerPoint menu>About Microsoft PowerPoint. - Does this issue occur when opening PowerPoint on another Mac that has the same operating system?
- Is there any error message? If there is, please give the screenshot.
After checking the information above, I suggest you to update Office.
Updating Office to the latest version may repair this issue.
If it doesn’t work, please uninstall Office completely and then reinstall it.
If you have any updates, please let us know.
—————————————Update————————————
More information about uninstalling Office for mac, maybe you could refer to “Troubleshoot Office for Mac issues by completely uninstalling before you reinstall”.
If possible, maybe you could create a new account to have a test.
If issue still occurs, please try rebooting Mac in safe mode, this helps you check if this issue is caused by incompatible login items or others.
Note: Microsoft is providing the two information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.
Regards,
Erin
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