Ways to Fix Facebook Messenger Chat Heads Not Working on Android:
There are a few things you can try if the chat heads feature in Facebook Messenger is not working on your Android device:
Restart your device
Sometimes, simply restarting your device can fix minor issues like this. To do this, hold down the power button and select “Restart” from the menu.
Update Facebook Messenger
Make sure you have the latest version of Facebook Messenger installed on your device. You can check for updates in the Google Play Store.
Check your device’s memory
If your device is running low on memory, it could be causing issues with the chat heads feature. Try closing some unnecessary apps or deleting some unnecessary files to free up some memory.
Check your device’s permissions
Make sure that Facebook Messenger has the necessary permissions to access your device’s features. To do this, go to Settings > Apps > Facebook Messenger > Permissions and ensure that all necessary permissions are enabled.
Check for a system update
If you have a system update available for your device, it could be causing issues with Facebook Messenger. Try updating your device to see if it resolves the issue.
Clear the cache and data for Facebook Messenger
Sometimes, clearing the cache and data for the app can fix issues like this. To do this, go to Settings > Apps > Facebook Messenger > Storage and select “Clear Cache” and “Clear Data.”
Uninstall and reinstall Facebook Messenger
If none of the above steps work, you may need to uninstall and reinstall the app to fix the issue.
I hope these steps help! If the issue persists, it may be worth reaching out to Facebook for further assistance.