Hi @Faye ,
Did you install any updates recently?
Did this problem only appear PowerPoint?
Did this problem appear in all PowerPoint files?
- Try to open PowerPoint in safe mode: Press Win + R, type "powerpoint /safe" in the blank box, press Enter. If it works fine in safe mode, please check the add-ins in your PowerPoint and disable them.
- Try to repair the Office application: https://support.microsoft.com/en-us/office/repair-an-office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
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