Ground Rules
Expected etiquette & response time
In a shared office, people absorb the norms by watching each other; in a hybrid team, those norms have to be written down.
Ground rules are the shared agreements about how your team behaves: when you are expected to reply, how meetings are run, what counts as available and what does not, how you handle it when someone does not follow through. These things exist in every team. In a hybrid team, the difference is that they have to be explicit, because you cannot pick them up by sitting next to someone.
Without written ground rules, every person on the team is operating on their own assumptions. The person who replies to everything instantly assumes everyone should. The person who responds end-of-day assumes that is normal. Neither is wrong, but the collision between those two assumptions is a constant source of friction.
Ground rules are not about control. They are about giving everyone the same starting point so that the friction is about the actual work, not about differing expectations nobody has named.