Teacher here. I have my laptop (16”) and an ultra wide (34”) on my desk, and a projector behind me. I keep my email, attendance, and calendar on the laptop screen.
On the ultra wide, I keep my grade books and various spreadsheets, since more width makes it easier to see more data, and I have my daily agendas/lesson plans. Again, more width makes it easier to see the whole week at once. I keep that fixed to 2/3rds width of the screen, and the other side is reserved for Spotify at like 1/6th width
The projector is used to show the daily agenda, videos, instructions, etc. I very frequently screencast my iPad to the projector, so I can fill out worksheets on it with the class and they can see me write or circle things.
I can’t even fathom having any less screen real estate now. I gotta be able to see it all at once!
Tufted titmouse.