How do I get rid of this black bar in the bottom of the screen?

Hi guys, 

Quick question, 
While editing, I kept seeing this black square next to my example screen and I also see a black bar at the bottom, also when I make it big. Tried to look it up, but no clue how to get rid of it. Anyone?
Must have clicked on something by accident, but don't know how to undo it.

Thanks for your help!!

The black frame to the left of your viewer is the multicam angle viewer. Shift-Command-7 will turn if off (or choose View -> Show in Viewer -> Angles).

Thanks david! I got rid of the black square, but on the overhead cam there's still the black bar.
I've added 3 pics. 2 of them are footage from Iphone and one from the overhead Panasonic cam.
Do you have an idea to get rid of it? Could it be a setting in OBS?
Thanks!!!

If you open some of those clips in QuickTime Player or VLC, for example, and the horizontal "bar" is there, then it's part of the source footage.

I haven't used OBS, but it would make sense that some sort of "lower thirds" overlay or graphic treatment was included in the recording(s)....

Yes we found out it's in the source overlay graphics!
Thanks for your help!!