@Cathy224, hm. I took the "1 night before and after" to mean that a guest could not check in on the same day a guest checks out. For example, if a guest is checking out on Feb 1, the next day available to book is Feb 2. Are you saying if you choose "1 night before and after", then next day available to book is Feb 3?
Hm. Now that I look at the Community Guide about preparation time, that answers my question.
https://community.withairbnb.com/t5/Tips-Tutorials/Preparation-Time-A-Community-Help-Guide-UPDATE/m-...
They really need to have better settings for this. All some people need is to not have same-day check-ins and check-outs.