Show only specified months

Hello.
Its possible at the Business Medium and higher versions. You are need to define these dates at the season filters in the Booking > Resources > Filters page. And then at the Booking > Resources > Availability page set those dates from the season filter as unavailable for the specific booking resource(s).
You can test it at the Booking Calendar live demos at this page.

My mistake, I wasn’t clear enough with my question. I meant if it is possible to change calendar settings so that it shows only 4 particular months. I can select 4 months from “Number of months” drop-down menu, but then it only shows 4 months from today and not months I would like. Thank you!

Unfortunately, such configuration is not possible. As you are already said, you can set the number of month(s) available from today in the General Booking Settings page. Please check also this info

Oh, this “start month” would do the job for me, but I can’t find what shortcode to use. Dialog box offers me resources and other settings, but no starting month. Could you write an shortcode example?

You can select the “start month” of the calendar at the popup configuration dialog, during inserting the booking shortcode (booking form) into the post or page. Just try to reinsert the booking short code.
Please read more about it here: https://wpbookingcalendar.com/help/inserting-booking-form/