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I can understand why you would try to resize it by selecting it or dragging and dropping, as the other elements of your page are edited in this way. When you click on the text box a dialog box should open up that will allow you to edit the header text, but it does not allow you to resize the text box or edit the type face.
The font size of the page header is a feature of the style that you select and cannot be edited in the same way that you edit the content in the body region of your page. We are working on making our styles fully customizable, and this is one area where we certainly want to make improvements