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Try the following to scale the content of the table when exporting responses as PDF.
1. Switch to the View Responses tab then click on the "Views" button in the toolbar, highlighted in red below:
2. Click the button on the far right of the toolbar (highlighted in red below) to switch to the Print Layout view:
3. When the Print Layout view is activated, you can use the slider shown above to scale the content down to have more of it fit on the page.
4. After scaling the content to a size that you're happy with, export the responses via the File menu.