ultimante member query filters directory
add_filter("um_prepare_user_query_args","um_custom_prepare_user_query_args", 9999 );
function um_custom_prepare_user_query_args( $args ) {
$args['meta_query'][ ] = array(
'relation' => 'OR',
'featured_clause' => array(
'key' => 'is_featured',
'value' => '1',
'compare' => '='
),
array(
"key" => 'is_featured',
"compare" => "NOT EXISTS"
)
);
$args['orderby'] = array(
'featured_clause' => 'ASC',
);
return $args;
}