How to Hide Eventin Admin Menus

function plt_hide_wp_event_solution_menus() {
	//Hide "Eventin".
	remove_menu_page('eventin');
	//Hide "Eventin → Dashboard".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/dashboard');
	//Hide "Eventin → Events".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/events');
	//Hide "Eventin → Organizers".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/speakers');
	//Hide "Eventin → Schedules".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/schedules');
	//Hide "Eventin → Bookings".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/purchase-report');
	//Hide "Eventin → Settings".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/settings');
	//Hide "Eventin → Template Builder".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/template-builder');
	//Hide "Eventin → Shortcodes".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/shortcodes');
	//Hide "Eventin → Add-ons".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/add-ons');
	//Hide "Eventin → Our Plugins".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/our-plugins');
	//Hide "Eventin → Get Help".
	remove_submenu_page('eventin', 'admin.php?page=eventin#/get-help');
	//Hide "Eventin → Go Pro".
	remove_submenu_page('eventin', 'https://themewinter.com/eventin/pricing/?utm_source=eventin+pricing&utm_medium=eventin+pro&utm_campaign=eventin');
}

add_action('admin_menu', 'plt_hide_wp_event_solution_menus', 100);
Where do I put this code?