I cannot grey out the apply button
Still not clear. Maybe you meant "I cannot UN-grey the Apply button" ? If yes, you must do some changes to the options in the page, before the Apply button would become active.
And i DO NOT get the options for left and right.
Sorry, but you must be more clear. Are you referring to the EDITOR, or to the GSX menu ? If you don't edit the parking, it's normal nothing will change in the GSX menu.
Or, are you saying that, you don't even see the Left/Right option in the EDITOR ? Sorry, but that's not possible.
In the editor, can you set "BOTH" for that parking ? Is it currently set to "NONE" ?