End-To-End Encryption Questions/Feedback

EDIT: The latest stable client doesn’t even include the encryption feature. Somehow this wasn’t communicated well or have I missed the detail that this is not working yet?

I wanted to test ENd-to-end Encryption and realized that it is not possible to enable the encryption on top level (Folder Syncronization/the green icon).

I don’t have one Folder Syncronization for my whole cloud, I have only several folders synced each with a different sync task.

Now I can’t enable Encryption on my folders (e.g. Documents, Photos, etc.) but only on the subfolders.

First question: is there a difference if I enable encryption on a Folder or on each subfolder seperately?
Second question: Would it be possible to add the feature to enable Encryption on Sync tasks (encluding root)?