With my Nexus 5 running Android 6 Marshmallow, I managed to disable the popup without root by first going to Settings -> App Notifications . Then click the three-point menu in the upper right corner and select Show system . After that, an item should appear in the list with the name System UI . If you click on it and then clear the Allow peeking , you will disable the popup.
Keep in mind that other system popups will also be hidden. I am pleased with this, although I have never been a fan of pop-ups. I prefer them to appear unobtrusively in the notification area. Also keep in mind that this will not affect the sounds.
Simon bengtsson
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