https://learn.microsoft.com/en-us/dotnet/api/system.globalization.cultureinfo.useuseroverride?view=netframework-4.8.1&viewFallbackFrom=net-8.0
CultureInfo.UseUserOverride Property (System.Globalization) | Microsoft Learn
Gets a value indicating whether the current CultureInfo object uses the user-selected culture settings.
property systemglobalizationmicrosoftlearn