rvm:
Okay, I did the tests using the portable version you linked to. The results are as follows: (1) using the command line options dpiawareness=0 and dpiawareness=1 does nothing--SMPlayer's interface is still grossly magnified; (2) using the environment variable QT_AUTO_SCREEN_SCALE_FACTOR=0 works--the interface looks as it does with version 7805, which is the look I prefer.
I might consider setting the environment variable at Windows startup and continuing to update. Or maybe you can fix it so that's not necessary now that you know what works...?
Thanks!