In this article, you'll be able to know the differences between Availability Window and Booking Window.

To go to this page on Hostify you just need to go to Listing Settings > Booking Settings

Availability Window

- this is an Airbnb dedicated functionality which Hostify controls. Via it you control how far ahead you want your calendar to be open and it only works for Airbnb.

while

Booking Window

- is pretty much the same as the Availability Window but it's Hostify standalone option, which manages the Hostify calendar and the channels connected to it to initialize the calendar as time goes on.

In addition, Availability Window has All Future Dates and in Booking Window you will only have until 2 years in advance to book on your property but it will open up +1 day
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You can learn more about the Booking Window option here -> Click.