How to Hide FileBird Lite Admin Menus

function plt_hide_filebird_menus() {
	//Hide "FileBird".
	remove_menu_page('filebird-settings');
	//Hide "FileBird → FileBird Settings".
	remove_submenu_page('filebird-settings', 'filebird-settings');
	//Hide "FileBird → Recommended".
	remove_submenu_page('filebird-settings', 'filebird-settings-recommended-plugins');
	//Hide "FileBird → Go Pro".
	remove_submenu_page('filebird-settings', 'go_filebird_pro');
}

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

Where do I put this code?