Toyota prius Owner's Manual page 254

2-2. Instrument cluster
 Switching the EV indicator and Eco Driving Indicator Light
activated or deactivated
STEP 1
STEP 2
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PRIUS_OM_OM47871E_(EE)
Select "EV/ECO".
Press and hold the "DISP" button
to enter the setting mode.
Select "ON" or "OFF".
Press and hold the "DISP" button
to finish setting.