How to Hide Humassistant Admin Menus

function plt_hide_humassistant_menus() {
	//Hide "Humassistant".
	remove_menu_page('humassistant');
	//Hide "Humassistant → Setup".
	remove_submenu_page('humassistant', 'humassistant');
	//Hide "Humassistant → Content Sync".
	remove_submenu_page('humassistant', 'humassistant-content');
	//Hide "Humassistant → Integrations".
	remove_submenu_page('humassistant', 'humassistant-integrations');
}

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

Where do I put this code?