Microsoft Word very slow to let me type the document name in the save-as dialogue box.

When I temporarily moved the Microsoft word folder out of ~/Library/Containers to the desktop, it temporarily fixed the problem. There is no spinning ball or watch; when I try to type in the document hame, the cursor does not appear and/or typing does not do anything. After a while, cached characters appear. While it will not let me type in the document name, the <Save> button becomes unresponsive. This problem happened out of the blue a couple of weeks ago. I am worried that I will not be able to save at all a while ago. My Microsoft Word container contains 12.7 GB; I do not know what is in there. I have customised the ribbon but not done anything huge. I have written lots of documents. I occasionally use Endnote, which is also very slow.

I got rid of Clean My Mac (by putting it straight in the bing). I have done generic things to speed up my mac: reset some different types of memory RAM by holding down keys as I boot, for example. I have about 100 GB of room on my SSD. I have a 2019 MacBook Pro. Word is up to date and so is the Mac OS.