I had tried this, it doesn’t work
<?php add_filter( 'hivepress/v1/templates/listings_view_page', function( $template ) { return hivepress()->helper->merge_trees( $template, [ 'blocks' => [ 'listings' => [ 'columns' => 3, ], ], ] ); } );
The snippet seems to be ok, please make sure that you added it as a PHP, not CSS snippet (e.g. via the Code Snippets plugin).
Yes I added it as a PHP. but I think it doesn’t work because my url is like this:
https://jomedit.com/?post_type=hp_listing&s=&_category=
instead of listing page…
It should still work there, the template is the same (listings_view_page). Please make sure that the snippet is added correctly and the website front-end is not cached (you can try disabling third-party plugins).