Three "Quality of Life" suggestions:
1. While in Fields View in ArcGIS Pro it would be helpful to be able to sort by highlighted fields. For example, if I have a table with a lot of fields, (say over 100), and I highlight five of them, it would be nice to be able to "resort" the fields view in such a way that all of the highlighted fields are on top or on the bottom of the fields view. This ability might also be useful for the Data Types and Allow NULL Fields View Columns.
2. I'd appreciate the ability to be able to highlight in different colors.
3. I think it would be helpful to integrate the Delete Fields tool right into Fields View as a checkbox.