Thanks for the solution that has been troubled me for a long time.Interesting.
One another attempt to access to "Access to notifications" menu:
1. Install Google
2. Install "Heads - up notifications" and open it:
3. Click green button "Turn on/off notifications"![]()
Heads-up Notifications - Apps on Google Play
Get the new heads-up notifications from Android Lollipop on any device!play.google.com
4. It should open lost menu where you will be able uncheck "Google" option.
5. Uninstall "Heads-up notifications" app, you don't need it anymore