How do I convert the All One Car Seat to booster mode?

To use in booster mode without the base, the harness must be stored. Remove the base from the vehicle, disconnect the crotch strap, rotate the bottom of the head support pad up and attach with hook and loop tape, move harness straps behind seat cover, and insert the buckle and crotch straps into the harness storage compartment. The child must be 30-100 lbs (14-45 kg) with proper vehicle belt positioning.

From the official Graco All One Car Seat manual, page 52

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