Setting boundaries with SO while WFH

Hey y’all, need some advice to help keep the home life/marriage healthy while working from home. We both work from home 80% of the time and sometimes have trouble being respectful of each other’s space. We don’t have a lot of room in our home for 2 private offices, his office is upstairs and I mainly work downstairs in our living room. I should mention that he owns his own business and can set his own schedule (he also isn’t all that busy most days). I work in a corporate environment that can be very meeting heavy at times.

I try to give him a heads up when I’m on a call so that he doesn’t walk in the room and try to strike up a conversation, or stroll around in the background of the room while my camera is on, but trying to set this boundary is creating some tension. He feels like the living room is a common space that he should be able to enter while I’m working and hang out or chat, unfortunately I’m really sensitive to distractions and this doesn’t work for me. To be fair, I sometimes pass through his work space too but he never has camera-on meetings. I tend to treat business hours as if I were offsite at another location and don’t socialize with my SO much during the work day.

Has anyone else ever managed to make it work with a dual WFH household? What strategies did you use to not disrupt one another?