I found four big changes although multiple small improvements were done in Android 15 beta 2.
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The private space is undoubtedly the next major feature you loved most regarding privacy and usability. Private space allows you to log in with a different Gmail account and create your private window only access by you.
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The archive feature I like most allows you to archive an App without fully uninstalling and restoring it as needed.
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The WEP networks enable/disable toggle, nide decide name in wifi and use randomized MAC are some major changes that enhance your privacy over Android.