How do you actually stay present after work?

This is probably dumb but genuinely asking: after a draining work day how do you switch mental gears and actually be WITH your kids instead of just physically present while your brain is still at the office?

I try to like... leave work at work but by dinner time I'm thinking about emails and the thing I messed up and the meeting tomorrow. My 6yo is telling me about his day and I'm nodding but not actually hearing it. Wife called me out on it last week and she's right. What's the trick here?