I can. This is a bug you are seeing we will have fixed in a future release. You are working in a "Local" form (not an online form) and that "Add submit button" should not be shown at all, that is only for an online form. If you move your form online when signed in, then it would have a Submit button automatically in Web View and in Page View would be able to be turned on and off.
Thanks Josh! You were absolutely correct!