Multiple pages are useful for breaking up long forms and can be created using Sections. Drag and drop a new Section onto your form where you want your page break and check the "Start new page" option.
Form Progress Indicator
You can also add a progress bar to your form when using multiple pages. This is useful on longer forms to show your users where they are in the process of filling out the form.
You can enable this function when creating a form by scrolling down to the "Form Extras" section on the left side of the form builder and toggling the "Progress Indicator" on. You must have more than one page on your form to enable this function.