When I open any flight program, a gray, upright panel appears on the upper left side of the screen. I believe it is related to the Custom Info Window, because the window appears over the gray triangle. I can access and modify the Window, however, when I move the Window to the other side of the screen, the rectangle stays. I can find no way to move, delete, or modify it.

I've read the manual, but the Tab left/right click method does nothing. I've deleted the cache folder. I'm at a loss.

I've thought there might be a method of reducing the color until it becomes invisible but have found no information.
I believe I might have generated the rectangle while fumbling several attempts in the Full Mission Builder, but I can't figure how it might all flights in Mission, Mission, Quick, and Single.

I'd take a picture and include it, but I don't know how to do that either.