For drag and drop make the two lines a plus sign to add them with one click to the report (they automatically go to the end of the report)

Make an X or - to remove them from the report (instead of the two lines and dragging to remove)

Remove the left/right scrolling - make the view area a list like when you pop up the modal to show/hide columns

Reverse the plain eye icon with the crossed out eye icon from the modal - the way they exist currently is backwards from what makes sense

add ability to move more than one column at a time

have an info button somewhere so you can see the api key of a field

Rename ID fields - ID (Applications/Nominations) is not easily found unless you know to search for just ID. People know it by Application ID or Nomination ID

Ability to categorize by form OR category for the categories on the left to choose from

Put "commonly used" fields at the top for each configuration type - I'll add more detail in the comments - similar concept to templates