What I really like about the old Webapp Builder is that you can click Save As and create a new copy of the App. I use it a lot to quickly create a few apps which look exactly the same, but are configured with different maps. It is also very useful to try a few changes on an existing app in production, without changing the actual app in production. That way, my product owner or user is able to compare the old and new configuration side by side and can decide what's best.
And now I'm really exited about the new Instant Apps, especially Minimalist is very useful and well received within my organization 👏. One small wish: Can I have as Save As button in the Instant App configuration? It would really help my workflow. Thank you.