Volvo XC 90 EXCELLENCE 2018 Owner's Manual Supplement page 14

HANDLE IN THE CARGO AREA
The car is equipped with a self-illuminating handle on the inside
1
of the tailgate. It can be used to open the tailgate from the inside
in an emergency situation.
– Pull down the handle to open the tailgate.
After use, the handle must be pressed back into its original
position manually.
1 Only applies to certain markets.