Dragged to proper width in Muse Design view, but doesn't show correctly in Preview?

Hello, 

From what I gather from your question, you are adding a form to your website using Muse Design View - and the form does not look like what you expect - did I understand that correctly? 

If so, please share the following: 

1. A link to the uploaded test page - or - a screenshot of what the preview looks like

2. A link to the form in question

If you need to adjust the width of the form, you have to do it within the form builder first, then add it to Muse Design with the expected width.

Again - I may have misunderstood your request, so kindly clarify. 

Looking forward to your response.