Data Space Field column should have "add field" in the consistent place

This is a minor thing. But I was just working through a new data space and just moving my mouse down field to field...

When a field can be for show or filter, the filter is on the right.

But when it can only be for show, the show option shifts right.

Since show is [i]always an option, if that was on the right hand side I could just work down the list in a straight line, shifting over for the limited number I want to use as filters.