Glad its sorted.
(Even if its not quite how you might imagine would be optimal.)
I find most people become rather disappointed with hybrid machines after they get to know them.
I might even say the majority end up swearing to never buy one again. 
Heres the Archwiki for pretty much everything you would want to know about PRIME:
https://wiki.archlinux.org/title/PRIME
PS.
One more thing. I find these tools largely unnecessary.
But some folks seem to like them.
They would provide you with ‘I want to reboot into nvidia only, intel only, hybrid’ options.
If that sounds good to you then see these tools like envycontrol, which I highly suggest over the alternatives like optimus-manager.