This would be very nice! We can already select and unselect certain columns, but adding in the ability to rearrange them to our liking would help a bit. I tend to glance to left side of the screen for all the information I need to quickly look at, and when you have a lot of columns visible, some get hidden on the right. Some columns are more important than others, so instead of manually turning them on and off, I can shove them to the side, and bring what matters for my task to the left.