When creating a multi-page form, you can allow the user to skip to further pages without filling out the required fields on the immediate page. This can be turned on in the Form Extra section on the Build tab.
The form submitter will not be able to submit the form until all required fields are completed. However, now you can see all pages without having to fill in all required fields on the immediate page.
If the form submitter tries to submit the form without a required field filled out, the browser will redirect the user back to the FIRST required field that isn't filled out. If this field is on page one, it will take them back to page one. It will also highlight all required fields that are not filled out.