Video screen shrunk

I put in a new image when I was editing, and decided to paste a filter I copied 5 minutes ago, suddenly the whole video shrunk! Looked kinda like this.

Does anyone know what I did and how it happened? I can’t seem to revert back to the original view and I’ve spent hours editing the whole thing. Even the undo button wouldn’t work.

Oh it’s okay. Found the solution. I filtered the master. This thread can be closed now

You should by the way download the latest version of Shotcut. That’s an old version you have there.