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Yes, you may increase the form's width by opening the designer, going to the styles tab and setting the desired with there:
You could also customize this with using the form's CSS class:
You may change the properties values as you want, this guide will help you to inject the code to your form: How-to-Inject-Custom-CSS-Codes
I would like to share you a guide that will help you to change the fields position so you display them as you need: Form-Field-Positioning
Hope this helps.