How do I convert the car seat to booster mode?
To switch to backless booster mode, first store the harness system by loosening shoulder straps and unhooking chest clip. Then remove the buckle strap from the metal retainer under the base pad. Finally, adjust the extension panel if necessary and attach base pad to the rear of the seat.
From the official Graco Graco 4ever Dlx Usermanual manual, page 78
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