Sometimes, we need to add larger size images or grid questions with many columns that could not fit properly into Google form’s default width, in this situation we need to change the width of google form. Google forms does not provide an option to change its width property. But you can change the width of your form in the Google Forms by using the Pretty Forms Designer Addon.
This article will guide on How to change the width of your form in Google forms.
Simply Select your form & Change the width property value.