How to hide some formats when click save

edited 11:58AM in FastReport .NET
When I use FastReport.net(Winform),in Print preview,it can save the formats to XML,Excel,CSV...and so on, now I want to hide some enabled save formats, for example,I just want to it only can be saved to xml, and the others formats are not shown in the contextmenu. Could you tell me how to realize this?Please have a look about the attachments, Thank you very much!

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.