Impossible to integrate filters (geodir-show-filters)

Hello,
I would like to integrate filters into the search.
For example, in my rental property, I have equipment and I would like to integrate filters for this equipment. Let me take an example: a visitor is looking for a parking lot with an elevator. When it is on the reload results page there is a button (geodir-show-filters) which opens menus.
I would like to integrate my filters here.
With the Listimia theme, I find filters in custom fields, but the fields do not appear on my “place”, neither in backoffice, nor in frontoffice.
How can I specify the equipment in my files so that it can be searched by the front-end visitor?
Thanks
Christelle