To edit the forms, you have to edit your listing type post then Filter tab and Filter Hero Section/Filter Header sub-tab. Filter Listing tab is for search results page’s form.

How to select right listing type post to edit?

It depends on listing type your are searching for? https://prnt.sc/qzysuy and the listing type has Hero/Header filter by type option checked: https://prnt.sc/qzyt3f
Otherwise, default listing type (which is set from TownHub Add-Ons -> Submit tab) form will be used