How do I lock the player's mouse to the center of the screen?

I'm trying to make a third-person shooter type game of sorts, and I'm running into a couple of problems. One such problem is that I want to lock the player's cursor to the center of the screen like how it's like in a first person shooter.

I have tried using the LockCenter Enum of MouseBehavior shown in ROBLOX Wiki (code below, but its just the example they gave), but my cursor still moves around freely.

local UserInputService = game:GetService("UserInputService")

UserInputService.MouseBehavior = Enum.MouseBehavior.LockCenter
UserInputService.InputChanged:connect(function(inputObject)
    if inputObject.UserInputType == Enum.UserInputType.MouseMovement then
        print("delta is (" .. tostring(inputObject.Delta.x) .. ", " ..  tostring(inputObject.Delta.y) .. ")")
    end
end)