What happens to someone’s tasks and notes when they leave the farm?

They stay on the farm, so your season’s history does not leave with the person. Remove takes away their access to this farm right away, and to this farm only; their tasks and the notes they wrote remain.

The tasks that were assigned to them now show Not assigned. Filter on Not assigned and give the ones still to do to someone else with Assignee. To bring the person back, invite them again.

The steps are in Change a teammate’s role or access.