Firebase UI login email list source, where are they from and can I delete them
<p>I am using the firebase UI login on Android from <a href="https://github.com/firebase/FirebaseUI-Android" rel="nofollow noreferrer">https://github.com/firebase/FirebaseUI-Android</a>, my question is: how or where does this library retrieve all my previous emails like this one picture. Can i delete some of them?</p>

<p><a href="https://i.stack.imgur.com/Djy7H.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Djy7H.jpg" alt="enter image description here"></a></p>