On Release Note of Google VR SDK for Unity v1.40 (April 2017) https://developers.google.com/vr/unity/release-notes
Note: You must enable dynamic library loading in VrCore to get the latest C++ GVR Updates. To do this, go to Settings > Developer Options
Enable Library Loading. If Developer Options are not visible, tap 7 times on Build Version.
I'm looking for on Nexus 5X(7.0), Nexus 6P(O Preview), Pixel XL(7.1), I cannot find "Enable Library Loading" setting in Developer Options. What's mean this?