Hi Sidnei,
Thank you for your interest in Syncfusion software.
At present we do not support altering the orientation of the PDF document loaded in the viewer. But it can be achieved as a workaround, in which orientation of PDF document can be changed before loading it in the PDF viewer. We have created a new direct trac incident for the follow up of the delivery of the workaround. Please log in into the direct trac for further follow up.
Regards,
Suresh
