I noticed that a guest withdrew their reservation but it still shows in my calendar. Am I supposed to delete it from the calendar? I thought it would be automatic once the reservation was withdrawn?
A reesrvation can not be "withdrawn", it can only be cancelled.
A reservation request can be withdrawn.
But in both cases the calender is automatically updated (dates being available again for new a booking). May you did not reload/refresh the page to see the changes ?