Here is a more common solution, which can be used for collections as well press View code in Settings to open Settings.cs

Add your property this way:

 [global::System.Configuration.UserScopedSettingAttribute()] [global::System.Diagnostics.DebuggerNonUserCodeAttribute()] [global::System.Configuration.DefaultSettingValueAttribute("")] public YourType PropertyName { get => (YourType)this["PropertyName"]; set => this["PropertyName"] = value; } 

YourType here can be collection like List<object>…