Meta Title of page properties

Hello,
I will wish to change the title tags of the pages of the properties, at least add the site title before the title of the property.
Can you tell me how?
Thank you in advance !

Hi Patrice,
Each property has field: Browser page title where you can enter the Title tag that you want to show on Browser bar.
Thanks
Dam

Ok Thank you,
I don't see this field in edit property, perhaps because of my OS Property version : 2.7.9.
But I see this code on compoments>com_osproperty>classes>listing.php :
$document->setTitle(OSPHelper::getLanguageFieldValue($property,'pro_name'));
So now I can change this and have a different document <title> than the title property (pro_name), with the site name, the type name and the city for example...
Patrice