Hi!
Yes…looks like the only way to do this for now is to turn on Professional Tools and create a Rule Set to apply in the Multi-Calendar Display for now (lots of other posts about this issue 😒).
Are you trying to change add custom trip/min stay using a Rule Set? If not, you'll have to turn on Professional Tools in your Account and then use a Rule Set to change the min stay for the dates.
Here are the articles and screen shots below. Pro Tools used to be only for hosts with 6 listings or more, but now any host can use Pro Tools:
Click Profile Pix
Click Account
Choose Professional Hosting Tools
Click Manage
Turn on Pro Tools
Turn on Professional Tools
https://www.airbnb.com/help/article/2499
Using Rule Sets
https://www.airbnb.com/help/article/2061/
Hope this helps! Let us know if it works for you!