A way to quickly show / hide a predefined set of fields on a grid page.
A field set is a group of fields. When a field set is created you add fields into it. Field sets are available in the field menu / button and the grid view "+" menu.
When you check a field set, all fields are removed and replaced with the field set.
A field set would be per entity type.
This would allow (taking the Shots entity for example) to have one field set called "Info" containing basic shot info, another could be "Progress" containing delivery dates, pipeline steps, notes etc... another one for "Editorial" containing shot timing, first/last frames handles etc...
The field sets could be reused in the Detail Page "Entity Info" views. "Important Info" could be a field set, "All Info" could be a field set, and other field sets could appear in the "Entity Info" view drop down.