ThemePickerGroup::getSites

private function getSites(): array
{
	$result = [];

	$res = SiteTemplateTable::getList([
		'filter' => [
			'CONDITION' => false,
			'=TEMPLATE' => 'bitrix24'
		],
		'select' => [ 'SITE_ID' ]
	]);
	while ($siteTemplateFields = $res->fetch())
	{
		$result[] =  $siteTemplateFields['SITE_ID'];
	}

	return $result;
}