Tooltips in Viewpoint on top of images

There is a tooltip that is appearing in Viewpoint. I don’t remember enabling it, and I can’t figure out how to turn it off, which I need to do, since it’s right in the middle of the image where I am trying to adjust the perspective lines. It gets in the way of adjusting the viewpoint lines.

2.3.0 Build 38.

What do you read in this tooltips ?
Maybe a screenshot to see.