Can my school see what I'm doing on my school issued laptop while connected to an external VPN?

I have a school issued laptop and I'm just curious how much of what I do can be seen by IT.

I assume that they can see everything I do while connected to my school's Google account and using their WiFi, but what about when I'm using my own google account on their device and my own VPN?

I also don't use Chrome, I only use Edge, and I'm a little concerned after hearing some rumors that my school district can read personal emails on personal google accounts while using their device

Edit: Thanks for all of the replies everyone, I'm just going to leave that laptop at work and bring my personal one if I need to do something else