PreferenceItem is deprecated. Use [SettingsProvider] instead.

I am still getting likes from my previous post I couldn't edit anymore. So here is an updated solution for future googler.

Code (CSharp):

1. #if UNITY_2018_3_OR_NEWER
2.     [SettingsProvider]
3.     static SettingsProvider YourNewPrefGUI()
4.     {
5.         //- If .Project it will appear in Project Settings instead
6.         //- Even in Preferences window, it is possible to place it outside of Preferences tree.
7.         return new SettingsProvider("Preferences/YourPrefName", SettingsScope.User)
8.         {
9.             //This is just the drawer. There are more to customize in the new provider system.
10.             guiHandler = (searchContext) => YourOldPrefGUI(),
11.         };
12.     }
13. #else
14.     [PreferenceItem("YourPrefName")]
15. #endif
16.     static void YourOldPrefGUI() {
17.         //...
18.     }