I'm usually teaching over Zoom / Nexi / Google Hangouts or something like this, not OBS. This is bi-directional, interactive teaching, not broadcasting / live-s

I'm usually teaching over Zoom / Nexi / Google Hangouts or something like this, not OBS. This is bi-directional, interactive teaching, not broadcasting / live-streaming a class. Those tools too can capture individual screens, but then how do you do a PowerPoint presentation when you only have one monitor?