How can I disable zooming on IINKEditorView. I saw that the Nebo iOS app doesn't have it.
I guess you refer to the "Pinch gesture recognizer" on iOS?
This latter one is defined the the pinchGestureRecognizerAction function defined in the iink\examples\ios\Frameworks\IInkUIReferenceImplementation\EditorViewController.mm file (line 190).
You can then update the function by yourselft to get it working as you prefer.