I"m a virgin at this...Help Please

I hit the wrong key and my entire screen is black. If I go to pages they are still there they just won’t show up. My side screen says no Bloc or Bric selected. I’m sure this is easy I just have no clue…Thanks in advance!

@ScottFordMusic Hi, you probably hit the “V” key (View mode)
It’s a quick preview mode in Blocs which you can toggle on/off.