How to return to lightrooms classic view

Hello,

Only recently I started using lightroom classic and thus I am pretty inexperienced and I am sure this is merely a matter of me not having a clue how this happened or what I do next. However I would really appreciate the help.

I was going through my last set of photos making selections while all of a sudden the classic way lightroom has always looked split into two windows - like you can see in the screenshots. The full view of the image was before I force closed lightroom completely fullview and I was not able to minimize it or interract with it. Upon opening lightroom again this is how it looks.

Normally the fullscreen view of the image can just be closed with Esc and then you'd return to the normal library view. Right now I have no clue how to get back to seeing my collections or library as a whole.

If anyone could help a newbie I would be forever grateful