You can remove them by using:

sudo apt-get autoremove nvidia*

It will remove everything related to nvidia, so make sure to double check before continuing.

You can also try this:

sudo apt-get purge nvidia*
sudo apt-get autoremove 

You can remove them by using:

sudo apt-get autoremove nvidia*

It will remove everything related to nvidia, so make sure to double check before continuing.

You can also try this:

sudo apt-get purge nvidia*
sudo apt-get autoremove 

I'm not sure if removing nvidia drivers will stop your nvidia GPU. It will probably still work and use Nouveau drivers, but I'm not sure.

Have you tried sudo prime-select intel with your nvidia drivers installed?