About one month ago i upload my first App to the PlayStore and I reserved it only for beta testers. The App is now stable and I decide to move it from beta to production tab.
For all those who have my own doubts I wanted to share my solution.
I clicked "YES" on the button that you see in the image, now all my beta testers are able to review and evaluate my app without having to uninstall the application or leave the beta test manually
hope it might be useful to someone in the future