To simplify management of privacy for mobile applications and to enable individuals who have worked with FullStory for the web to have a more familier experience, FullStory for Mobile Apps instrumentation creates virtual HTML-like elements for native Android or iOS views for the purposes of privacy management, funnel definition, and searches. read more here
FS.addClass to add a class name, and
FS.addClasses to add multiple class names for a mobile view.
Some pre-configured classes that may be applied to control privacy include
fs-unmask, read more about FullStory for Mobile Apps Privacy Rules