You save it from inside the plant editor. In the top row you'll find the icon for it.

Regarding workflow i think it has to do a lot with experience. Having used a lot of 3D applications in the last 20 years i must say i never have seen such an easy to use program as Vue. BUT, when i used version 1 as a demo i was not impressed at all and deleted ir right away - BECAUSE of the interface. Only after i did the first 2-3 images in Vue 4 (on Mac) i became a fan. But again, a very subjective pov, everybody has to make their own experiences - and decisisons.

One day your ship comes in - but you're at the airport.