No Saturday Check in Calendar Propblem

When I set rules for my direct booking website - for example, no Saturday check in or check out - it shows those days as greyed out.  It gives the appearance that those days are already booked and someone may not make a new reservation because they believe the dates are taken.  Could you somehow just put something under the calendar that says "no saturday check in or check out?"  I've attached a screenshot to show what I mean.  I have NO bookings in June of 2025 yet but it looks as though I do have one every Saturday.