All dates are fully blocked - none show as 1/2 blocked as both the first day and last day of any booking should show on the calendar - with a 45 degree angle and half red but still able to be booked.
If you need to make changes like in this screenshot Awesome Screenshot, then unfortunately, it will require customization.
Our calendar displays a red dot with a message (is displayed only when the reservation is for one day, in other cases, the beginning of the booking and the end of the booking will be available as they can be booked, and other dates between them will be blocked), as shown on the screenshot Awesome Screenshot.