After someone got out of the back of our 2-door 2020 Jeep Wrangler, the base part of the seat would not go all the way back AND the backrest part of the seat would not lock into place. The backrest part of the seat would move the full range from all the way forward to all the way back without locking in. To fix it, I pushed down on a black horizontal bar under the seat and I was able to move the base part of the seat back. When you push down on the horizontal bar, just move the base part of the seat backward; you don't need to worry about the backrest.. that all locked into place afterward. I hope this works for you if you have a similar problem.
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