Details available here: https://forum.xda-developers.com/android/general/howto-4-to-disable-heads-notifications-t3197660
Long story short is you need to run this command:
adb shell settings put global heads_up_notifications_enabled 0
Long story short is you need to run this command:
adb shell settings put global heads_up_notifications_enabled 0
You need to have adb installed and connected mobile with USB cable
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