Mac os sleeps on OBS

It seems the only way I could get OBS to show a live website is to not put it in full screen preview mode yet point the commander Commando style at the screen zoomed in.

I do get an accurate picture but the problem is that the OBS and Macintosh think I've been away from my computer not doing anything when I was capturing video footage directly on it.

How do I tell the screensaver not to go into screensaving mode?
 
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