This feature team has been aware of this request, and it is under review.
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You state in the following *completed* topic that this suggestion (Turn off message preview in notification toast) is also complete, which is simply not true (see item 6. in the link):
It says to see the documentation around notifications for more detail:
There is nowhere in this documentation that mentions a feature where you can hide message content in a desktop popup notification.
Please clarify whether this feature has been added or not, and whether it's going to be added in future or not.