Hello @ASASG Sorry if you missed it, but for now the Beta testing is just for the inbox. Check out this thread. Once the team releases Beta testing for other features we will let you know and you can opt to take part!
We also have the suggestions thread What Features Would You Like to See on THS? for general suggestions/feedback.
In the meantime, your suggestions about the applications and inbox are helpful for the current testing and have been passed on to the team. Thank you.