Thank you for the provided input. The issue you are having is due the fact that your detail section will grow if exported or viewed in Print Preview to the width of the page. This means that in your case you have two options - use docking
for the textbox so that is always with the width of the detail section or initially set the detail section to its maximum width, the width of the page and then setup your textbox. Additionally if you do not want the border to be set on the page but where you designed it to be you can use a Panel
and style it appropriately.
In order to avoid unexpected behavior when printing try using the Print Preview option, which in your case will show the same as the exported PDF.
the Telerik team
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