How to Hide FlexStock Admin Menus

function plt_hide_stock_sync_with_google_sheet_for_woocommerce_menus() {
	//Hide "FlexStock".
	remove_menu_page('ssgsw-admin');
	//Hide "FlexStock → Setup".
	remove_submenu_page('ssgsw-admin', 'ssgsw-admin');
	//Hide "FlexStock → Add-ons New".
	remove_submenu_page('ssgsw-admin', 'ssgsw-add-ons');
	//Hide "FlexStock → Log".
	remove_submenu_page('ssgsw-admin', 'ssgsw-admin-log');
}

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

Where do I put this code?