[OutbackJon]

This guy's camera work is terrible and he leaves out the part of accessing the screw on the left side, but I haven't found a better video. (Video is for removal of the head unit, but it should start at the part for removing the knee panel trim.)
To get to the screw on the left side, with the door open, pop the triangular panel off the side of the dashboard, where it meets the door. One screw is under there.

 

[OutbackJon]

@CO17Forester The airbag is actually behind that plastic panel, mounted to a metal bracket. Other than the single screw under the triangular panel, the only thing holding that panel in is some plastic clips.

At least on my 2017, it's one panel from the screw under the triangular cover, all the way over to the tiny panel that you are talking about on the right.