[ad_1]
Hello.
In your screenshot you have capacity 15 for booking resource with ID = 4.
If in the booking form at the WP Booking Calendar > Settings > Booking Form page, you have 2 time slots: 10:00 – 12:00 and 12:00 – 14:00, then it is means that you can do 15 different bookings for each specific time slot, until specific time-slot will become unavailable.
So your configuration already good for your conditions.
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/
Kind Regards.