How do I convert the seat from 5-point harness to booster mode?

Loosen and remove the harness straps, disconnect the chest clip, disconnect the elastic loops and retaining strips to remove the seat pad, remove the crotch strap anchor, and fold and tuck the harness components into the seat recesses. Then reinstall the seat pad. To convert back to 5-point harness mode, reverse these steps.

From the official Evenflo Maestro Sport Car Seat manual, page 37

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