How to Hide Skysa Scroll-to-Top App Admin Menus

function plt_hide_skysa_scroll_to_top_app_menus() {
	//Hide the "Skysa Bar Apps" menu.
	remove_menu_page('skysa-key-config');
	//Hide the "Skysa Bar Apps → Bar Configuration" menu.
	remove_submenu_page('skysa-key-config', 'skysa-key-config');
	//Hide the "Skysa Bar Apps → Scroll-to-Top" menu.
	remove_submenu_page('skysa-key-config', 'skysa_app_0');
}

add_action('admin_menu', 'plt_hide_skysa_scroll_to_top_app_menus', 12);

Where do I put this code?