add this shortcode to yourthem/functions.php or any snippet code plugin

add_filter('op_api_result',function($result,$api_action){
    if($api_action == 'get_app_list')
    {
        global $op_session_data;
        $is_waiter = isset($op_session_data['login_cashdrawer_mode']) && ($op_session_data['login_cashdrawer_mode'] == 'waiter'|| $op_session_data['login_cashdrawer_mode'] == 'customer') ? true : false;
        if($is_waiter)
        {
            $result['data'] = array();
        }
        
    }
    return $result;
},10,2);