In order to make your chat heads work again, you need to go to the Notification Center of your phone.
This will allow you to enable chat heads for Messenger on your iPhone.
Alternatively, you can tap on the three-dot at the top and select Delete all app timers.
They don't take up much space on your screen and appear whenever you minimize the Messenger app.
Next, you have to scroll down a bit until you see a "Chat Heads" option with a blue toggle to its right.
Update The Version You must find out the version of your smartphone that you own right now.
So, what to do when the messenger chat heads not working on the Xiaomi smartphone? When you install Facebook Messenger on an Android device, chat heads are enabled by default.
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