I use a Samsung Galaxy 7. OS is Nougat.
Previously notifications used to be small texts in notifications area.
Now I get an annoying small popup window for every app upon notification.
Any ideas how to stop this?
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I think you're referring to Heads-Up notifications (those notifications which pop up on the top of your phone's screen).
The following methods have shown to completely disable them for all applications while maintaining regular notifications in the status bar. All of these methods are free. Some require a rooted device and some don't.
Non rooted devices
Check if your device is listed in output, then proceed
adb shell settings put global heads_up_notifications_enabled 0
Install Terminal for Android.
Open the application. Use the following commands:
(The indicator should change from "$" to "#"). Next enter
settings put global heads_up_notifications_enabled 0
Using heads app switcher app
One XDA developer has generously shared thier 50 lines of code embedded in this app to switch on/off Heads-Up notifications from quick settings for Android N
Root required. Reboot not required