@Tecratonic. There is the Caffeine Gnome extension and also Caffeine app, which was in Software Store.
See this: Remove blank screen after inactivity - #4 by zabadabadoo
Although I have used Caffeine on Windows, I have not on ZorinOS.
If you have Lite (XFCE) then see if the Caffeine app, (not the gnome extension) will work. Let us know the result, as do not know if successsful or not from that other thread.