function plt_hide_google_site_kit_menus() {
//Hide the "Site Kit" menu.
remove_menu_page('googlesitekit-dashboard');
//Hide the "Site Kit → Dashboard" menu.
remove_submenu_page('googlesitekit-dashboard', 'googlesitekit-splash');
}
add_action('admin_menu', 'plt_hide_google_site_kit_menus', 11);