Editing Desktop Notification on Manjaro Deepin 18.1.2

How to edit or configure " Desktop Notification " whenever there is a notification?

Notification message box appears at the top right corner and it is so convenient.
But how to change that message box size and message box duration?
Is the " dconfig Editor " the right one to use?
If so, I can't find it the right place.
Please.Help is much needed here and I really appreciate whoever knows it.
Thanks a lot.

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