Advanced options and css field and next previous buttons

How come I can't get into the advanced options and css section of this new form I am creating?

Also this new form seems to have next and previous buttons which I would prefer not to have.

I created this from a "duplicate" of another form I created and that form is just a single page scroll up and fill in fields type of form and has css input and advanced formatting options.

Could it have to do with the fact that I created the from in question on an imac and the form I duplicated from on an ipad?

I think I figured it out. The new form with the page URL here didn't have the legacy layout.  Any other info regarding my previous questions would be appreciated though.  Legacy layout seems so much cleaner and simpler to me.  Why did it change?

Please note that if your form was created under the new layout then you will not be able to customize it using CSS codes. As you already noticed only the legacy layout allows to inject CSS codes to the forms. 

The new layout has been developed to create simple and easy-to-fill forms; however, you can switch the layout on the form settings if you want.

If you have any question, please let us know.