There's a grey box on my background
I've noticed there's a grey box on my background every time I have Microsoft Word open.
I can't click on it or anything, so it's very weird. When I close Word, it disappears.
Is it bad or can I do something about it?
Every time I zoom out the grey box becomes to smaller grey transparent boxes.
I've tried to insert screenshots, but since they had to be maximum 2 MB, I had to crop them a lot.
MacBook Pro (13-inch, 2017, 2 TBT3), macOS High Sierra (10.13.6)