Changed class name .hdden to .hidden for .mapping-options__add-filter.
Added transition styling to the v2 data mapper content items and made max-height on closed !important.
Added v2 versions of all clickable triggers and content blocks:
data-category__h1_trigger--v2
data-category__h1_content--v2
data-category__h2_trigger--v2
data-category__h2_content--v2
data-category__h3_trigger--v2
data-category__h3_content--v2
Use the class .is--closed on the content blocks to toggle them to closed.
The arrow icons in .data-category__h1_trigger--v2 is controlled by adding or removing is--closed to BOTH icons. This will hide the one and show the other.