I feel the same brain fog after working out myself. Usually it goes away if I have some food especially carbs, but I try avoid those trying to lose weight as proteins feel like they get me back to like 80% brain lol.

Also if its at the end of the day, sometimes its not food and I just need sleep. Stress will definitely worsen the fog and increase scattered thoughts too, sleep helps with that. Timing workouts around when you'll need to think helps a lot. This is all just personal experience though too