Hi, thanks for coming into the forums. I'm also a user like you and will happily help you to the best of my knowledge.
If you encounter this issue on other Office 365 apps, please restart the PC and perform the repair at Windows settings > Apps & Features > Find Office > Modify > Quick Repair.
If the quick repair doesn't work, please choose online repair.
Reference: https://support.microsoft.com/office/7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b
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