FacetWP - sort resource archive items by title

functions.php

<?php

// Add to your (child) theme's functions.php
add_action( 'pre_get_posts', function( $query ) {
    if ( $query->is_post_type_archive( 'resource' ) ) {
        $query->set( 'orderby', 'title' );
        $query->set( 'order', 'ASC' );
    }
});