https://learn.microsoft.com/en-us/dotnet/api/system.configuration.settingspropertycollection.remove?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
SettingsPropertyCollection.Remove(String) Method (System.Configuration) | Microsoft Learn
Removes a SettingsProperty object from the collection.
system configurationremovestringmethodmicrosoft