For prepare logo for your page you should use special element Webmagic\Dashboard\Elements\Special\LogoLinkElement
Use next code for define logo:
$logo_link_element = new \Webmagic\Dashboard\Elements\Special\LogoLinkElement([
'part_one' => 'Interface',
'part_two' => 'Generator',
'part_one_mini' => 'I',
'part_two_mini' => 'G',
'link' => url('/'),
]);
$page->setFieldContent($logo_link_element, 'header_logo');
return $page->render();You will see - http://joxi.ru/D2P3pjvcdwKQ9m and http://joxi.ru/xAevaGVcYMj3kr