Subaru Legacy BN/BS (2015-2019) Owners Manual: Power rear gate - if power rear gate does not operate properly

Rear gate (Outback) - if the rear gate cannot be opened

In the event that you cannot open the rear gate by pressing the rear gate opener button (all models) or using the power rear gate (if equipped), you can open it from inside the cargo area. ...

When the power rear gate is deactivated

CAUTION When operating the power rear gate manually, do not use excessive force. Doing so may cause a malfunction. NOTE While the power rear gate is temporarily deactivated, if ...

Other materials:

Fastening the seatbelt
WARNING  Never use a belt that is twisted or reversed. In an accident, this can increase the risk or severity of injury.  Keep the lap belt as low as possible on your hips. In a collision, this spreads the force of the lap belt over stronger hip bone ...