Thank you for your interest in Syncfusion products.
Regarding ‘changing page background’:
At this moment SfRichTextBoxAdv control does not have support to change page background, whereas background colors will be preserved while loading Word documents. We have already logged this requirement as feature request. We will implement this feature in any of our upcoming releases. We will update you when this feature has been implemented.
Regarding ‘changing page orientation’:
We have attached the sample to demonstrate how to change page orientation. Please do find the sample from below link.
Please let us know if you have any other questions.
Arumuga Perumal S.