Please note, this forum is only about the support of Booking Calendar Free version. If you will have any questions about the paid version, then contact here https://wpbookingcalendar.com/contact/
Unfortunately, currently it’s does not possible to configure the actual versions of Booking Calendar to show the dots or another background for the days, which was partially booked, and where calendar have the specific capacity. We will add improvements to this feature to the TODO list for having it in future updates of the plugin, but I can not say when this feature will be implemented. Sorry.