What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You can inject this to adjust the width of "nom et prenom du beneficiaire".
To adjust the width to your desired preference, simply change the value of the yellow highlighted code.
Here's a guide on how top inject css: How To Inject Custom CSS Codes
If you need further assistance, do let us know.