Hi Erwin,
Sure you can. There’s a filter to modify any arguments supplied to the wp_dropdown_categories function for each dropdown.
So to exclude one or more terms just hook into the filter:
function btf_modify_categories_dropdown’( $args, $taxonomy ) {
$args['exclude'] = 'TERMID';
return $args;
}
add_filter( 'beautiful_filters_dropdown_categories', 'btf_modify_categories_dropdown’, 10, 2 );
Change TERMID to your term “featured” id.
Best of luck!