These locks are intended to help prevent children from accidentally opening the rear doors. Use them on both rear doors whenever a child rides in the rear seat of the vehicle.
If you slide the child safety lock to the lock position before closing that door, the door cannot be opened from the inside.
The door can only be opened by pulling the outside handle.

Locking, Unlocking with Door-
Lock Knob
Doors and LocksStarter Inspection [Mzr 2.0, Mzr 2.5]
On-vehicle Inspection
1. Verify that the battery is fully charged.
2. The starter is normal if it rotates smoothly and without any noise when the
engine is cranked.
If the starter does not operate, inspect the following:
Remove the starter, and inspect the starter unit.
...
If the 12-volt battery is discharged
If the 12-volt battery in your Subaru Solterra becomes discharged,
specific procedures can be followed to restore power and restart the EV system safely.
These steps are designed to help you regain functionality in emergency situations
without causing damage to the vehicle’s electrical syste ...
Opening the Hood
With the vehicle parked, pull the
release handle to unlock the hood.
Insert your hand into the hood opening,
slide the latch lever to the right, and lift
up the hood.
NOTE
The lever is located a little to the left of
center when facing the vehicle.
Grasp the support r ...