How can i lock my mouse in the center, but have my camera type on scriptable?

If you name a local script 'CameraScript' and place it inside StarterPlayerScripts, it will replace the default CameraScript with your script.

When using a normal local script inside somewhere that isn't StarterPlayerScripts this won't work, but if you use this method you can.

For example I can name my local script 'CameraScript' and place it in StarterPlayerScripts. I can then add this:

local userInputService = game:GetService('UserInputService')

local player = game.Players.LocalPlayer
local camera = workspace.CurrentCamera
local mouse = player:GetMouse()

wait() -- You can remove this, but I do this just in case.

camera.CameraType = Enum.CameraType.Scriptable

userInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

userInputService.InputChanged:connect(function(inputObject) -- You can still read mouse delta.
	if inputObject.UserInputType == Enum.UserInputType.MouseMovement then
		print('Delta X:' .. tostring(inputObject.Delta.x))
		print('Delta Y:' .. tostring(inputObject.Delta.x))
	end
end)

You can read more about this on the wiki page here.