How can I remove/delete old/unwanted notifications from Parallels Toolbox apps

I have the following problem: Various Parallels Toolbox apps save notifications even though notifications are explicitly disabled for these tools. These notifications are no longer displayed (right!) but remain stored in the system. They will be found and displayed by EtreCheck for example. How can I permanently remove these notifications from the system?

THANKS IN ADVANCE.

 

Hello,

> These notifications are no longer displayed (right!) but remain stored in the system.
What do you mean by 'stored in the system'? Where are they stored and why do you bother about it if notifications are not shown anymore?

 

What I am interested in:
I don't want a Parallel Toolbox to save notifications if I have disabled notifications for the corresponding tool. In this case the tool should not leave any traces.

If I knew how and where Parallels tools save their notifications (e.g. as a .plist file), I could delete these traces manually.

 

Parallels Toolbox shows notification using standard API provided by macOS. None of these notifications are saved anywhere by Parallels Toolbox.
I can suggest that macOS itself stores information about notification somewhere in system plist files. But programs can't affect it.