Custom Filter in (yith woocommerce ajax product filter)

Hi there! i need to know where is the ajax code called by the filters and how i can trigger this ajax, because i did some tweaks to (price sliding) using functions.php, and i need call again the ajax that was calling in this filter before but doesnt work, then i had put in the code a form submit and it works but not with ajax.

you can watch the example here:
https://somosdata.com/winespectrum/shop/

https://www.ads-software.com/plugins/yith-woocommerce-ajax-navigation/

Thanks in advance.