https://learn.microsoft.com/en-us/dotnet/api/system.speech.synthesis.installedvoice.enabled?view=netframework-4.8.1&viewFallbackFrom=net-10.0-pp
InstalledVoice.Enabled Property (System.Speech.Synthesis) | Microsoft Learn
Gets or sets whether a voice can be used to generate speech.
property systemspeech synthesisenabledmicrosoftlearn