A family of Microsoft word processing software products for creating web, email, and print documents.
Please see: Select Text
In the future please do not tack onto an existing thread. Nothing personal but doing so is referred to as hijacking the thread. The content of other threads may not be relevant but more importantly responders rarely revisit old threads so your message may never be seen or addressed.
If the existing suggestions don't work for you submit a new message of your own stating all particulars relevant to your issue, including macOS & Office Version Numbers.
BTW: A restart of the Mac quite often is the only cure needed for this as well as many other abnormalities.