I have just gone back to Ubuntu.
My GPU works just fine, and so does Libre.
In the future I may branch out into other distros, but to get to know stuff I will stay with Ubuntu just now.
Zorin touts itself as being a stepping stone from Microsoft to Linux.
For that to be true, everything should work out of the box, and it does not.
With Ubuntu, it does.
Look at the variety of terms used in the posts above !!
This sort of learning curve is far too much for a newcomer to Linux.
Way too much knowledge and info required, just to get up and running.
The "Support" that comes with the payment for the Pro version, is questionable.
In truth, I think that Zorin owes me a refund.
Not yet decided if I will request this, or perhaps place my experience on my social media.