How to Hide Max Mega Menu Admin Menus

function plt_hide_megamenu_menus() {
	//Hide "Mega Menu".
	remove_menu_page('maxmegamenu');
	//Hide "Mega Menu → Menu Locations".
	remove_submenu_page('maxmegamenu', 'maxmegamenu');
	//Hide "Mega Menu → Menu Themes".
	remove_submenu_page('maxmegamenu', 'maxmegamenu_theme_editor');
	//Hide "Mega Menu → General Settings".
	remove_submenu_page('maxmegamenu', 'maxmegamenu_general_settings');
	//Hide "Mega Menu → Tools".
	remove_submenu_page('maxmegamenu', 'maxmegamenu_tools');
}

add_action('admin_menu', 'plt_hide_megamenu_menus', 11);

Where do I put this code?