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To do that, you should use the Shrink option.
What I would suggest is to check out this great guide: How to Position Fields in JotForm
I suggest checking out the entire guide, but if you want to see just what would be needed for the specific setup, then you should check out the sub title: Utilizing the power of Shrink.
Do of course let us know if there is anything that you would like to ask or need assistance with and we would be happy to assist.