function plt_hide_contact_form_7_menus() {
//Hide "Contact".
remove_menu_page('wpcf7');
//Hide "Contact → Contact Forms".
remove_submenu_page('wpcf7', 'wpcf7');
//Hide "Contact → Add New".
remove_submenu_page('wpcf7', 'wpcf7-new');
//Hide "Contact → Integration".
remove_submenu_page('wpcf7', 'wpcf7-integration');
}
add_action('admin_menu', 'plt_hide_contact_form_7_menus', 11);