I'm personally not too concerned with cases like this. I mostly avoid personal activities on work equipment unless they're benefit-adjacent. My thinking is if they over-snoop and see health or financial data they shouldn't see (and it gets out), it'll look bad because I was managing benefits that are part of my employment.

Outside of that, I keep my use very benign. I'm logged into the Financial Times and Stackoverflow. Most companies with knowledge workers won't look at any metrics they collect unless it's a security thing or they have a reason to look. But yes, assume that they can look if they want to.

Once they start snooping around, they're probably going to fire you regardless. They just need a story to tell.