Hi all, So, I gave up trying to figure out the reason for :alt etc. not working and simply implemented a move keymap for floating groups, akin to what ratpoison has (IIRC). Works for me and means I don't have to use the mouse which is a real bonus!
I'll need to do a resize as well in due course but it was moving that was frustrating me (as all windows sat on top of each other) and I have a very large monitor... Thank you, eric -- Eric S Fraga via gnus (Emacs 29.0.50 2022-08-16) on Debian 11.4