Thank you.
Videos and searches are a challenge, since videos about these often move about, zoom in, etc. and websites like the Spacedesk manual page often smooth scroll.
The Likebook Mars is too small for this, but if I can find good screen sharing options for it, I can get a feel for my options.
P.S. I'm looking for screen sharing options. Duet Display is supposed to be the best, but their website isn't accessible, and triggers my migraines. Spacedesk isn't compatible, and their website isn't accessible either.
P.P.S. This lists a number of Mac-compatible options. Most are Mac + iOS but a few work with Android too:
https://techwiser.com/duet-display-alternatives/
P.P.P.S. Tried using Splashtop free with my Boyue Likebook Mars, but trying to deal with screen size differences, cursor lag, and flashing led to yet another migraine, and... that's not a way to avoid migraines. My current pdf app has trouble with the screen size adjustments.