1. Then you will need to add that code conditionally. You can add following code in your theme’s functions.php
add_action( 'wp_head', function () {
if( !empty($_GET['fep_to']) ){
echo '<style type="text/css">.fep-form-field-fep_pro_to {display: none;}</style>';
}
}, 99);
2. You can follow https://www.shamimsplugins.com/support/topic/add-meta-data-fields-to-the-directory/#post-13499