https://learn.microsoft.com/en-us/dotnet/api/microsoft.toolkit.mvvm.messaging.imessenger.unregister?view=win-comm-toolkit-dotnet-7.1
IMessenger.UnregisterTMessage,TToken(Object, TToken) Method (Microsoft.Toolkit.Mvvm.Messaging) |...
Unregisters a recipient from messages of a given type.
microsoft toolkitobjectmethodmvvmmessaging