Then modify the logout link in _mainmenu.htm to somenthing like this
a href="<?= Backend::url('acme/backendskin/auth/signout') ?>"
next create new class that extends Backend\Skins\Standard
namespace Acme\BackendSkin\Skins;
use Backend\Skins\Standard;
class BackendSkin extends Standard
{
public function getLayoutPaths()
{
return [base_path() . '/plugins/acme/backendskin/layouts',
$this- >skinPath.'/layouts'];
}
}