Pick the spot, and keep it the same
A desk or table against a plain wall, with the window to the side rather than behind. A window behind turns your child into a silhouette and the instructor cannot see their mouth, which is most of how pronunciation gets corrected.
Use the same spot every week. Children settle into a routine far faster than they settle into a room, and a corner that means "this is where Arabic happens" does a surprising amount of work.
