These are not very good videos but they show the basic operation and approximate performance.
Power the machine on, boot CP/M. It comes up as white text on black, full screen "window", at 1024 x 768 resolution it's 48 lines of 128 characters per line. A bit stark here but there's 16 colors foreground and background.
Running WordStar on the big screen; 128 column width is wider than anything from the 70s and 80s so WS doesn't know how to use the whole screen!
Some extended demonstration of screen resizing, more than you'd typically do while running programs.
With some of the demo-text "busy" programs running, more window resizing.
A more practical example; assemble BNKXIOS, the extended IO system for MP/M analogous to the CP/M BIOS, made relocatable with LINK, then GENSYS is run to re-create MPM.SYS, which is copied into place on the A: drive. The the new MP/M is booted and run.
The window system tolerates having the underlying screen resolution changed. The default is 1024 by 768, but 800 by 600 and 640 by 480 are available.