How to Hide Sellkit Admin Menus

function plt_hide_sellkit_menus() {
	//Hide "Sellkit".
	remove_menu_page('sellkit-dashboard');
	//Hide "Sellkit → Dashboard".
	remove_submenu_page('sellkit-dashboard', 'sellkit-dashboard');
	//Hide "Sellkit → Funnels".
	remove_submenu_page('sellkit-dashboard', 'sellkit-funnel');
	//Hide "Sellkit → Global Checkout".
	remove_submenu_page('sellkit-dashboard', 'sellkit-checkout');
	//Hide "Sellkit → Discount".
	remove_submenu_page('sellkit-dashboard', 'sellkit-discount');
	//Hide "Sellkit → Coupons".
	remove_submenu_page('sellkit-dashboard', 'sellkit-coupon');
	//Hide "Sellkit → Notices".
	remove_submenu_page('sellkit-dashboard', 'sellkit-alert');
	//Hide "Sellkit → Settings".
	remove_submenu_page('sellkit-dashboard', 'sellkit-settings');
	//Hide "Sellkit → Upgrade to Pro".
	remove_submenu_page('sellkit-dashboard', 'upgrade_to_pro');
}

add_action('admin_menu', 'plt_hide_sellkit_menus', 16);

Where do I put this code?