Ah, @Augustinas0 your listing may be one of the ones where Airbnb has set Instant Book as a default. If that is the case, you are not able to remove it. You should read up on how Instant Book works. Here are all the help articles I could find on IB:
https://www.airbnb.com/help/article/523/learn-about-instant-book
https://www.airbnb.co.uk/help/article/990/how-do-host-cancellation-penalties-work
(Note the section on Instant Book host cancellations)
You can try to remove Instant Book in two ways. First go to Manage Listing, then to the right of Calendar and More and Preview, you'll see a lightening bolt. Click on it to disable.. A second way is to go to the listing editing menu and click on Booking. Under Who Can Book Instantly, select No one...
If you don't see these options, then you are stuck with Instant Book. You can leave feedback about this here:
https://www.airbnb.com/help/feedback