How to prevent form submission upon hitting enter key?

I have had several clients when navigating through my form press "enter" (instead of Tab) and it automatically submits the form before they are finished completing it.  Is there some warning I can give them that will stop the form from being sent after pushing "enter"?

Thank you for contacting us.

The workaround is to add a Preview Before Submit widget to the form. This will add an extra review step, the form will not submit upon hitting the enter key.

If you need any further assistance, please let us know.