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If you are using the "Print" button in the submissions page, it can only print one submission at a time.
However, this is still possible by downloading the submissions using the download PDF button at the top of the grid list:
You will then have 1 PDF file with all the submissions listed in the grid, you can then print all of the submission in that PDF file in one click.
If you want to download partially the submissions, you can do that by following this guide: http://www.jotform.com/help/73-How-to-Partially-Download-Form-Submissions-as-Excel-CSV-PDF
Do let us know if you need more information on this.