The blinds have little nubs on them that you can't see. Like many other Porsche parts, they unlock in a specific sequence. It's a gentle push in and then you move them laterally to release the nub from the hold. If memory serves correct, it's a down and to the left movement. As you already discovered they are delicate, so work it like a puzzle, gently and you should have success. Once you see it apart the reverse is easy.
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