Guest's choosing arrival time earlier than allowed
I have a check-in time set up on my account - from 4pm. But often, when guests book they select an arrival time several hours earlier. I'm not sure why booking.com allows them to select a time before the check-in time? I then have to send messages explaining why it isn't possible, and sometimes guests are disappointed, as if I'm taking away something that booking.com has already offered them.
Is there a way to adjust my account so that guests can only select an arrival time after my (already set) check-in time?