Visible fields as re-arrangeable checkmarkable dropdown lists

[bhajneet]

It would be nice to re-arrange fields for presentation/overlay (see css rule "order" for flexboxes) and to toggle them "on/off" within one dropdown. Clicking would turn on or off the field, clicking outside the dropdown would close the dropdown.

This would greatly cut down on the options within some tabs and allow for them to perhaps be merged together with subheader sections for a single tab.