Toyota Lexusc Owner's Handbook Manual page 155

INTERIOR EQUIPMENT
To activate the automatic retract function, place the knobs
in the active position.
If you do not want to activate the automatic retract
function, push the knobs to place the inactive position
while pulling the luggage cover toward you.
To reactivate the automatic retract function, push the
knobs again to return them to the active position.
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Removing luggage cover
To remove the luggage cover, lift it up after pushing
forward the lock release knobs on both sides.