I noticed when I am on autopilot for the g/s it says “alt hold” but I have no idea how to disable that.
Hmm… I’ve never seen ALT HOLD before. I’ve seen ALT CST though. But I would think it depends on how you setup your approach.
I would recommend watching these channel a bit.
Here you learn many things on how to set up an A320 accordingly. Especially these two videos (for your issues):
