As Didie previously said, horizontal paging is currently not supported and we have no immediate plans for its implementation.
Regarding the issue you are facing, there are two possible solutions:
- Set large PageSIze to the document, so that the generated table has more space.
- Modify the logic of the export to "break" the table into several smaller tables. My suggestion is to try measuring the columns of your RadGridView and basically create separate tables from small sets of columns (as demonstrated in your example below). What you should be aware in this regard is that RadDocument's model does not allow consecutive tables, so you should make sure to add at least one empty paragraph between them.
I hope this is helpful! Let us know if you face any issues.
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