Hi,
Just to let you know, if you reduce the HotbarSlotCount number in the Config.json file from the server side and then, if you want to put back some slots, it seems like you can't.
I find out that the hotbar.json file in the Layout folder from the Gui is not updating on the client side automatically.
I don't know if this is something you want to fix, but it's not a problem for me, since I work it manually.
Have a nice day!