local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local player = Players.LocalPlayer
local playerGui = player:WaitForChild("PlayerGui")

local LOCK_ORIENTATION = Enum.ScreenOrientation.LandscapeRight -- change the "Right" to "Left" if you don't like the way it set

RunService.RenderStepped:Connect(function()
    playerGui.ScreenOrientation = LOCK_ORIENTATION
end)