At the risk of causing myself embarrassment, and just in case there is anybody else out there that didn't know this, I realised only a few days ago that to get a full screen preview in Media Player you just need to double click on the playback window.
On my PC's (or should that be PCs) the response and the resolution seem better in this mode.
But I suppose everybody in the world knew that. :~)
Yes I knew about the ALT+Enter and the menus items but the double click seems faster and too me it looks sharper. Perhaps it's just my imagination, running away with me.
Hey, that would make a great song title, wouldn't it?