"Default" editing screen

I have been a participant in the Lightroom forums for many years. I am trying to get my feet wet with Adobe Premiere Pro, but it's going to be a long, slow, painful process. Somehow I have gotten my Essentials  editing screen messed up and can't seem to get it back the way it was when I first started using Premiere. Is there some sort of shortcut that will restore that arrangement, or is the whole interface supposed to be sort of a free-form open ended situation? Sorry to have to ask such basic questions.