WARNING: This page is about a different car, the 2021 Porsche Cayenne, 2020 Porsche Cayenne, and 2019 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.
Unscrew fastening screws -1, 2-
.
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Fastening screws
Release side retaining strip -3-Arrows-
and remove it.