I saw a similar post to this (117014) but I didn’t quite understand what the resolution was and the topic is now closed.
I brought in an image that needed a slight rotation, which I was able to do, and then I needed to square up the resultant. I used the mask to do so. Only problem is, is the original rectangle is still referenced, and when I try to frame the image on my workpiece, both the width and height are now exaggerated because a tilted rectange has greater geometry than the trued-up rectangle.
As far as I remember from that former discussion - there is no solution to that. The selection frame will always stay like that. There is no way to change it and no intention to change for coming LB versions.