Bookworm Deluxe online game code on EA app

Ordered Bookworm Deluxe with online code from Amazon. I have been playing on EA app. All of a sudden I can't play on full screen. I went into options and tried to switch from there but nothing happens. I get a little square in the middle of my screen. How to fix? Went in and repaired EA app. It looked like they checked for updates during the repair. Played this game for years with no issues. Help!