IKEA PAX wardrobe, properly remove drawers

Hello, I have a Pax cabinet with rail drawers, now something has fallen behind the drawer so that it no longer closes properly. I thought I could simply lift out the drawer, but no... can someone explain to me how that works? Thanks.

So, there are two types of systems. In the first one, the rails are on the side and connected to the rails with two screws. These must be loosened, then the drawer can be removed. In the second variant, it's even easier; you just have to look at the bottom of the drawer and turn the two white brackets to the side, then remove the drawer. Hope I could help you