The caption in customize view at the bottom of each of the columns says "Move to a different tab" but it is just below the word "Width" for the column. I always thought this meant to swap column sizes rather than moving resources to different columns and/or tabs. Moving the phrase "Move to a different tab" ABOVE the column width would make the meaning more obvious.
Basically turn the first image into the second


Yes, it's a small thing but would have saved me a lot of time had it been this obvious