Help, I accidentally got a split screen that covers everything - Resolved

Worlds_Edge

I'm not sure what I clicked on, but I suddenly got a split screen.  So I can look at my figure in two different modes or two difference perspectives, which is very cool.  However, I don't know how I did that.  More importantly, I can't figure out how to get back to the normal view.  The split screen covers everything, so I can't get to smart content, scene, etc.  I tried dragging the windows, clicked on all the arrows etc, but I was unable to figure out how to get rid of this view and go go back to a view where I can do things.  I've attached my screen shot.

All help much appreciated.

Edited to add - I don't see a way to choose "single viewport."  By opening up another instance of Daz Studio, I figured out that is what I need to do, but there is no place to make that selection.

Worlds_Edge

Shift F11 got me to the regular window.  Then I had to select my workspace style again to dock the viewport in the right space (it had gone off to the side and I couldn't drag it back into place).