Nvidia switchable graphics

Today I went to Dell and installed latest Nvidia driver for this 7530 laptop with P2000 card. Can I just go to Nvidia and download these drivers and the driver will have switchable graphics?
in the Nvidia control panel, it is set to AUTO, I think that lets the system decide when to turn on the discrete graphics card?

How does the system know when to use the Nvidia card vs the graphics in the CPU?

I also read this can be set by each app here. Would be nice if MS listed apps, rather than having to openly search for apps which dumps you at root of windows drive.
which I am not sure where installed apps are to be found? In which folder are the apps?
Or is this something the system just does ok without you telling it to use dedicated Nvidia graphics?

click Browse and you are dumped at C: to look for apps

Some more ways of setting which card to uses when.
I have never had a system with switchable graphics, so this is all new to me.
Maybe there are only MS type apps in the presented list as I just recently got the laptop and have not installed a lot yet.

But I did install google play games app to let windows run android games
And that works well. I don't know if those games are using Nvidia or Intel graphics.
And the play games app is not showing in the list