It sounds like you are running an old style Bed and Breakfast, where guest are expected to be out all day and not return before a certain hour.
The VAST majority of other Airbnbs are not like this. Many younger guests or guests from other parts of the world will have never stayed in a place where they are required to leave the premises during the day.
I don’t see any mention of this requirement in your house rules. If you are going to have this expectation of guests, you need to make it crystal clear in the listing.
In fact, you should mention it in several places in the listing and in the rules. Maybe even in the photos.
BTW: Airbnb employees don’t read or respond to this forum.