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Are you trying to fit your fields like this?
If so, then you can achieve it by injecting this code to your form:
This guide will help you to inject the code to your form: How-to-Inject-Custom-CSS-Codes
Here is also the link where I applied the code so you can take a look to the live sample: https://form.jotform.com/61968945700971
If this does not help, please provide us more details about what you're looking for, we will be glad to help you.