Adding More Form Columns

There used to be a CSS work around for adding more form columns using Groups.  This appears to be gone with the release of the new builder.

Does anyone know how to add more than 3 columns to a form in the new builder?  There is so much wasted space in my forms resulting in lengthy forms and my users having to continually scroll.  

Hoping this will be added natively, but any CSS would also be helpful.

Thanks in advance!