Question Bubble Notification on ColorOS OnePlus 9 Pro

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Aug 21, 2016
Anyone here using the ColorOS on the 9 / 9 Pro ?
I have a problem with bubble notification which is not be able to enable from the settings.
Here's what I've tried
- Looking through all messenger's settings
- Looking through all notification settings, including apps
- Enabled Picture n picture and allow the apps to display over other apps
- ADB list the settings in global / secure / system and found notification_bubbles in the global but I tried put adb shell settings put global notification_bubbles 1 and no bubble.

Does anyone know how to enable the bubble or at least if unable, to report this bug to the Chinese ColorOS developers.

would be appreciated for your answer