For sure the availability window is set to 3 months and the calendar shows ALL dates available from now up until the end of the Calendar in 2024. The availability window has no effect. I tried changing it to 6 months and also back again to 3 months with no visible change of availability on the calendar.
I had blocked off manually some dates in Dec/Jan because I was getting a lot of requests for that time period that I had to decline. I've undone that but the question is still how do I make only dates in the next 3 months available on the calendar? What is the point of that setting otherwise if I have to make the change manually?