Personal computer + employer’s WiFi [duplicate]

I decided to use my personal Macbook at work, so I’ll be using my employer’s network connection. But I’m really concerned about my privacy. I know I can do non-work stuff using Tor Browser or Brave’s Private window with Tor, but what about my reminders, notes, voice memos and other Apple’s built in apps? I am really freaked about my personal stuff. How can I prevent them from accessing it? I know they may never do it, but if there is even the smallest risk, I want to prevent it somehow. Let’s say I create another user account specifically for work without logging my Apple ID and use it, will it prevent them from accessing my data stored on another (personal) account?