Window keeps disapearing

I'm trying to edit a video on iMovie but i launch it but the window is nowhere to be found. I go to mission control and the window appears but when i select it it minimizes to the top right corner and it is driving me insane. How can i resolve this problem

Odd. I would try deleting the preference file for it. You can find it in:
yourhomefolder/Library/Preferences

It should be named com.apple.imovie.plist.

I acutely just solved the problem by selecting window then zoom