A family of Microsoft word processing software products for creating web, email, and print documents.
Dear Saverio,
I am Renzo, as an Independent Advisor and Office user, I'll help you with your question.
Is the affected file too large?
Does the file has linked external connections to others Office files?
How many users are co working with the file at same time?
For test purpose, you could create a copy of the files without formatting, so try following process:
- In desktop Word app, open affected file > copy all content with Ctrl+C, then create a new file and Paste with the option "Keep the Text Only", then check out the file behavior.
Word for the web has some limitations, you can compare between local app in below link: