How do I disable inputs in portrait mode?

I'm trying to develop a mobile game where the primary interface is GuiButtons and it operates in portait mode. As such, I need to remove the Move and jump buttons from the interface.

I attempted so using this in a LocalScript in ReplicatedFirst

game:GetService('UserInputService').ModalEnabled = true

However, nothing happened. Is this a bug?

I don't believe that Apple nor Roblox support portrait mode in the app itself. You may be able to do it in computer mode, but I do not think that you can make the Roblox app into portrait. There is code to remove GUI options but the Joystick and jump button are excluded from that.

Again, Roblox may change this in the future (I remember reading a Roblox blog article about them developing this) but for now, this is not possible.