This is one such project. I have never loved the basic standard bifold doors in our kitchen, but I didn’t hate them enough to do anything about them sooner.
Remove the roller pin thingy (pretty sure that is it’s technical term). See image above. You can keep the doors so that they pivot on the already existing pins.
I then removed the door hardware. At this point I needed to do some math. Because I was turning these into french doors, and adding hinges and trim to the wall.