It would be helpful for users to be able to browse the PowerApps internal apps list and filter between production apps and apps that are in development or are only for demo usage.
This is definitely on our radar. We plan to improve this experience through enhancements with environments and the admin center.
Note the references below (more is coming out as the features are released):
https://www.youtube.com/watch?v=fl17EScTdV8 (Starting at 55:19 frame)
Thank you for your continued feedback and patience as we enhance features,