What older version?
I've tested it now in 5.21.6. It seems to work like this (in
Full row select mode).
Right-clicking:
- the selected or focused item line shows file(s) context menu;
- a text in not-selected item shows file(s) context menu;
- empty space below the last file shows folder context menu;
- empty space to the right of the last panel column shows folder context menu;
- empty space to the right of any left aligned column in not-selected item line shows folder context menu;
I believe the last point is what your screenshot shows. And it still behaves like that even in 5.21.6.