How to add checkboxes to the Bitrix smart filter?

Question

1C-Bitrix

Hey! Thank you for your prompt assistance, so I would like to ask about a system that is completely unfamiliar and alien to me. I always avoided it and put it off for later. Now, it's fucking time.
In general, 1C Bitrix. Site tula.foxunion.ru
According to the task, I need to make the filter look like this:

Where to swap the inputs? And the worst thing is how to add checkboxes for filters. I looked at some information blocks there, in general, nothing is clear at all.
And to catch up with the second point:

There, in the selector, double properties are indicated. So I climbed the site in the hope that somewhere in php it was clogged with what to output, but I didn’t find it either.
Save please help!!

Answer 1

You only freelance. The filter is already customized.
To get started, turn on edit mode and hover over the component. There, select edit template and look at the path to the component template. It needs to be edited