Actually if you watch the final episode from ordinary adventures. There was a point where the Rey character accidentally turned her saber off and turned it back on quickly. You’ll see it is a standard light saber with a plastic blade.
They made it look like a retractable blade by means of lighting and where she was positioned in her first appearance.
It was obvious after the fact that they were dueling pretty heavily with it, smacking blades against each other and off the rails, etc. A thin film blade never would’ve stood up to all of that.