WEBMar 31, 2020 · How to Use the IKEA PAX Wardrobe Planner. 1. Layout the room. When you first open the tool, it starts you with a square, generic space. You need to first make it the size of your space, walls, doors, nooks, windows, all of it. You can change the wall color and flooring as well, but we won't worry about that here.