Photoshop - I can't see any background or layer
First I think it's imporant to say that I'm still somewhat new with Photoshop but I love playing around with it; I was recently trying to create a thumbnail for a YouTube video and all of a sudden I can't see any layer or even the background. I'm not sure exactly what might be causing it but I've done some reasearch and I can say that it's not the application frame issue as I do have that checked off. Does anyone know a fix for this?
Thank you for your help and advice in advance, hope you all had a great holiday season so far!

