Morning Star wrote:
I wonder, Searcher...
When your picture is open and there is some space around it (NOT the workspace of PSE itself, but space between the picture and the border of the floating window, you can right-click that space, then select grey, black or custom colour.
I don't use this feature very often, but it's handy to see, for example, what colour mat would look nice with the photo, or even to make (part of) the photo stand out for fixing what needs fixing.
Thank you MS, it's a new one on me. I don't recall ever having the frame larger than the picture before, so I have not noticed this.