Get unity project window to show images,How to get Project window to show images?

I use Unity for a class and my teacher messed something up. If you ever watched an official unity tutorial you know what I’m talking about. How you can actually see what a prefab looks like before you drag it into the scene. It’s just showing up as blue boxes right now.,I use Unity for a class and because of something my teacher did I can’t see things like assets and models as images, just little blue boxes. I want to see what the models and prefabs look like, if a unity tutorial is looking for a robotic ball I want to know what the ball looks like from the project window. You know what I mean if you ever watched an official tutorial.

in the lower right corner of the window (or upper right?) is a slider. move it to the other side.

Try the upper/right dropdown button called “layout”.