local plrGui = game.Players.LocalPlayer:WaitForChild("PlayerGui")

local screenGui = Instance.new("ScreenGui", plrGui)

local txtButton = Instance.new("TextButton")
txtButton.BackgroundTransparency = 1
txtButton.Size = UDim2.new(0, 0, 0, 0)
txtButton.Modal = true
txtButton.Text = ""
txtButton.Parent = screenGui

screenGui.ResetOnSpawn = false

local userInputService = game:GetService("UserInputService")
local guiEnabled = true

userInputService.InputBegan:Connect(function(input, gameProcessed)
    if not gameProcessed and input.KeyCode == Enum.KeyCode.Z then -- you can change Z
        guiEnabled = not guiEnabled
        screenGui.Enabled = guiEnabled
    end
end)
warn("active")