Modify "Listing search" element in my Wordpress theme or source code PHP file

Hello, I have 3 requests related to my website [login to view URL]: 1) I'd need to change the parameter search in the element "Listing search" of my Wordpres theme (and I think it is not possible from the WP platform). I explain better: my WP theme is organised with listing fields (listing location, listing type, listing category and listing tags); when in my home page I added the "listing search" element" from WP Bakery page builder, the two default fields used in the search are "listing location" and "listing type"; I'd like to change the second field into "listing categories" so that when a user performs a search he can choose by category (so for example "bars", "bakeries" in the original theme) and not by type (so for example "Cuisine", "Culture" in the original theme). See screenshots. 2) How can I set the specific page (and also template) which will be display when I click on the search button in the "Listing search" element? 3) how can I integrate the elementor plugin in my WP theme without errors? at the moment, installing the elementor plugin, when I press "modify with elementor" the page does not load correctly but with parts of the source code in the homepage. Thank you.