A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
This happened to me after a recent WIN10 update. I'm using Office365 and had no problems until a couple of weeks ago.
I found that if I left-click in the top left-hand corner of the green bar at the top of the spread sheet, a small drop down box appears. Left-Click on "Move" and a small + icon appears in the middle of the green bar. Left-click and hold on the + icon, and then you can move the the spreadsheet around the screen.
Hope this works for you.