How to Hide myStickymenu Admin Menus

function plt_hide_mystickymenu_menus() {
	//Hide "My Sticky Bar".
	remove_menu_page('my-stickymenu-welcomebar');
	//Hide "My Sticky Bar → Dashboard".
	remove_submenu_page('my-stickymenu-welcomebar', 'my-stickymenu-welcomebar');
	//Hide "My Sticky Bar → + Create New Bar".
	remove_submenu_page('my-stickymenu-welcomebar', 'my-stickymenu-new-welcomebar');
	//Hide "My Sticky Bar → Contact Form Leads".
	remove_submenu_page('my-stickymenu-welcomebar', 'my-sticky-menu-leads');
	//Hide "My Sticky Bar → Sticky menu settings".
	remove_submenu_page('my-stickymenu-welcomebar', 'my-stickymenu-settings');
	//Hide "My Sticky Bar → Recommended Plugins".
	remove_submenu_page('my-stickymenu-welcomebar', 'msm-recommended-plugins');
	//Hide "My Sticky Bar → Upgrade to Pro ⭐️".
	remove_submenu_page('my-stickymenu-welcomebar', 'my-stickymenu-upgrade');
}

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

Where do I put this code?