For UE4.23 Preview 6, the xml file is renamed from GearVR_APL.xml to OculusMobile_APL.xml.
Commenting the line from that xml solves this issue.
For UE4.23 Preview 6, the xml file is renamed from GearVR_APL.xml to OculusMobile_APL.xml.
Commenting the line from that xml solves this issue.