Toyota Sienna 2010 Owner's Manual page 68

Center seat (8-passenger models)
To use the second center seat in the forward position, install it
according to the following procedure:
Slide the front seats forward and stand the seatbacks in the
STEP 1
upright position.
STEP 2
Remove the second center seat from the normal position.
STEP 3
(→P. 65)
1-3. Adjustable components (seats, mirrors, steering wheel)
The second center seat can be
used in the forward position.
Fold the front seat side table (if
equipped) down.
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