Lars of Mendix: “Our new Stories UI is now in beta! You can try it out by going to the Stories section of a project and clicking "Enable new UI". We're still hard at work adding new features and improving performance and would love to hear what you think. Please share your feedback in the #new-stories-beta channel on our Community Slack.
You can join the Mendix Community Slack by clicking here.”
The idea forum might be the way to go: https://forum.mendix.com/link/ideas
see also: https://forum.mendix.com/link/ideas/1702