borders

hey yall! im streaming a windowed projector to discord, and for some reason its adding bars around it, like this: does anyone know why its happening?

Here's what I would like to see available. Here is how the suggestion works: As you're looking at the picture, see the right side arrow which is pointing to the left. I want to grab hold of the vertical border with the mouse and move it to the left, so I can trim the picture down and eliminate...