If you want to test out the experimental features, you might want to install the beta version of Physics Lab. Here is a quick guide on how to do this:
For Android/Windows users, please visit here. Usually the “Preview” is the latest beta, while the “Latest” is the last release version if you want to roll back.
For example:
For iOS users, we are using the TestFlight link for participating in beta testing. Once you install through this way, you can constantly update to the latest beta version inside the TestFlight app. In case you want to roll back to the last released version, simply go to the App Store and install Physics Lab again.
Please feel free to ask any questions.