Toyota 2015 Prius Owner's Manual page 260

2-2. Instrument cluster
Switching the EV indicator and Eco Driving Indicator Light
■
activated or deactivated
STEP 1
STEP 2
238
PRIUS_OM_OM47A17U_DVD_(U)
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.