You can play the ball off your own glass walls
Padel rules · Walls
This is what makes padel unique. After the ball bounces once on your floor, it may rebound off your own back or side glass walls, and you can still return it as long as it has bounced on the floor only once. Playing the ball off the walls is a core defensive skill.
📘 Category: Walls. This is one of the rules that most often confuses players coming from tennis or pickleball.