How would I update this script into Non-Experimental?

I recently returned to Roblox to find that all of my games have a experimental mode warning on them. I've never really been a up to date script and my code has usually been janky or out of date. Most of my games still work for the most part, but my GUIs are broken. Any of them requiring input just don't want to work anymore. Below is an example of a script I used to use in my buttons to turn on/off GUIs that has now broken. The page the experimental mode warning took me to is a 404 page and I have no idea where to start. Any help is appreciated.

one = script.Parent.Parent.labelOne
two = script.Parent.Parent.labelTwo

function toggle()
    if one.Visible == true then
        one.Visible = false
        two.Visible = false
    else
        one.Visible = true
        two.Visible = true
    end

end
script.Parent.MouseButton1Down:connect(toggle)