How to Hide the "Sendinblue" Admin Menu

function plt_hide_integration_for_elementor_forms_sendinblue_menus() {
	//Hide the "Settings → Sendinblue" menu.
	remove_submenu_page('options-general.php', 'webtica-sendinblue-free');
}

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

Where do I put this code?