@Donna610
Airbnb is aware of a bug with Notes as a result of the Summer Release and are working on it. In the meantime, as a workaround you can turn on Professional Hosting Tools and use the Multicalendar, as the Add a Private Note feature is still available there. This is a workaround until Airbnb fixes Notes on the regular calendar. All Hosts can use Professional Tools, even if they only have one listing. The multicalendar is only available on desktop though; not the App:

