Can we make the form any bigger when embedding it into a webpage?

Yes, when you embed a form it will fit the HTML element where the embed code is placed on, the form is configured to take 100% of width, it's possible that the element where the form has been placed on does not have enough width so you would need to increase it, unfortunately, that needs to be done from the source code of your site.

Now, if you're referring to a different matter, please kindly share us the link to your page as well as more details, we will be happy to have a look on this.