Schedule conflict for the same session

The calendar blocking feature for multiple sessions at the same time works very well. The only thing missing is the start-time blocking for two sessions of the same type. In this example, I’ve already booked a client for 10:00 a.m., so the calendar is blocked from 10:00 a.m. to 11:00 a.m. However, another client can still book at 9:15 a.m., 9:30 a.m., or 9:45 a.m., which causes unwanted overlap.