Hi Mojtaba Madadkhani,
You have guessed right, the FlowDirection property of RadBook and RadRichTextPageView must not be set.
The page view control determines the flow direction of the text using other mechanisms in order to be able to show text in LTR and RTL languages in the same document. Setting this property interferes with the inner logic, hence the incorrect behavior.
Removing the FlowDirection property should solve the issue.
the Telerik team
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