I’m a freelance consultant/trainer but I only have one computer, I use them to split my personal and client specific functions.

I actually use three desktops:

one for my “Normal” usage, so my personal e-mail, news, youtube, lemmy, netflix, etc. one for my gaming, I usually have up the game, notes, spreadsheets, streams, etc. one for my work, with client related websites, notes, code, file explorers, etc.

When I’m teaching I actually have a second user login for my computer that I switch over to. This is to prevent me accidentally sharing anything on my screen that I didn’t intentionally prepare ahead of time. Especially things like accidentally showing my other client’s files/notes, downloads/recent files, browser history/autocomplete, etc.