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You can change the font family of some particular parts of text by using RadFlowDocumentEditor's CharacterFormatting property. The following code snippet shows how to insert two paragraphs with text - the first one is with font family "Jokerman" and the second one is with font family "Times New Roman":
"First paragraph is Jokerman."
"Times New Roman"
"Second paragraph is Times New Roman."
You can find more information about styling the content by following this link to Chaging Current Styles documentation section
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the Telerik team
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