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Are your referring to the fields in your most recent form (https://www.jotform.com/62437110626146)? If you want to adjust the field's width, then you can do so by following the steps below.
1. Click on the gear icon to open the properties wizard.
2. Then on the properties, click Options. Change the value on the width box to change the field's width. Save to apply the change.
Another method would be to inject custom CSS code to the form to adjust the fields width. I did notice that you already have custom CSS to your form, so you can simply modify those to adjust the width.
If you are referring to a different form or a specific field, please let us know so we can better assist you.