Clean desk policy, no take-home printouts, clear whiteboards with confidencial information, etc…
I had a WFH employee who once burn himself at home while making coffee with his own coffee pot, and sue the company as he claimed was a job-related accident. We had to settle and pay him, or have Unions making a big fuzz.
There are all sort of people in the workplace, and policies try to accommodate not only CEO whims, but also to manage a crowd full of many different types of people.