Tyler C. answered 12/05/20
Solo artist/musician willing to part with 9 years of knowledge!
No, they cannot see what apps you are using, unless you somehow let them snoop around on your device.
However, if you are referring to internet usages, they do have full access to data usage via your network provider, which they would have to verbally request from the company.
In terms of apps, though?
I wouldn't worry too much. Just keep a password or pin on your computer.
Good luck, and I hope this helps!