Facebook Messenger talk heads disappeared in the wake of installing Android 6.0 Marshmallow update? Indeed, this is because of the new app authorizations the board on Marshmallow which is preventing Facebook Messenger from putting overlay visit heads over different apps.
You can enable it back by doing this:
- Go to Settings » Apps » and contact the “Settings” symbol on the upper right corner.
- Select “Draw over different apps” from the Advanced choices.
- Select “Enable” from the rundown of apps.
- Switch On “Grant drawing over different apps“.
That is it. This will permit Facebook Messenger to show over different apps