@Vahid23
Hello Vahid -
We have a 30 day minimum stay at our place as well..
I am not am super computer savvy or an Airbnb expert.. but try this....
Go to the main page of your host dashboard.. it will say:
Welcome back, Vahid and show all of your current and upcoming reservations.
On the top of that page are drop down menus.. Today - Inbox - Calendar - Insights
Click on the Calendar drop down - and your reservations Calendar will open.
On the right side of the Calendar page is Pricing and Availability. Click on Availability
There are boxes for minimum stay and maximum stay. Type 30 days in the minimum stay.
That should set your reservations minimum stay at one month.
I think that should do it.. fingers crossed!
Best,
John