Kate Arrow, Deserted Wood Glitch

Hi!
I've been playing this casual game without any problems. Today, the screen of the game completely fills the computer screen so I can't see inventory, hints, goals, etc. This is a hidden object game and the list of objects at the bottom of the screen can not be seen either. I tried options to see if I could make the game screen smaller but the was a message about the smaller version not being supported...
any ideas? Thanks in advance!

What resolution do you have your desktop set to?
It sounds like it's set lower than the one the game uses.