Setting Search criteria: Search form
In case the first part of the value is search_form, the search criteria of the component will adjust to the search criteria specified in the search form.
Example: You are to configure the flight component, specifically its departure and return dates. You do not want to restrict the flight component distribution by dates. Thus for the flight departure date you should select search_form.start_date, and for the flight return date - search_form.end_date.
The dates of the flight component will adjust to those specified by a tourist in the search form.
In case you want to make the flight component more flexible, you can set a period to be added/distracted from the specified on the search form. For that, from the drop-down, select the required value: