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Vertical spacing inbetween elements and text can be configured in the Designer of the form under the Line Layout tab.
Line spacing and vertical padding control the space between text and elements.
I hope this helps you. If you were asking about how to eliminate the padding around the form that is different steps and I would be happy to help you with that too if that is the case.
In addition to that, you can reduce the spacing for each field by going to "Preferences". Under preferences, go to "Field Styles" tab. On the Question spacing, it represents the padding top, right, bottom and left.
You can also try injecting this custom CSS code.
padding-top: 6px !important;
padding-bottom: 6px !important;
Here's a guide on how to insert CSS code.
Hope this helps. Thank you.