Pre-select current month name

<?php

// Add to your (child) theme's functions.php

add_filter( 'facetwp_preload_url_vars', function( $url_vars ) {
    if ( 'food-calendar' == FWP()->helper->get_uri() ) {
        if ( empty( $url_vars['FoodMonth'] ) ) {
            $url_vars['FoodMonth'] = [ date( 'F' ) ];
        }
    }
    return $url_vars;
} );