How do I create a new page template in Upfront Builder?

Hi,

How do I create a new template for a new page type in Upfront Builder? For example, if I wanted to create a new contact page layout. Similarly, how do I create a new layout for a post?

When I click on the LAYOUTS button I can edit existing layouts or create new ones from the list in this screenshot. But that's very limiting.

I've seen these options in the Editor but not in Builder - and previous support questions have confirmed that I don't need to use the editor if I'm using the builder.

I don't know if it's just me but the more I use Upfront, the more frustrated I get. I've decided to use WPMU Dev's tools in the quest to build my own agency after quitting my day job - and I'm spending most of my time grappling with Upfront, asking support questions and wondering if issues are bugs or just lack of clear documentation. I know it's a good system it's just not at all intuitive.