Strange. Mine does . See screenshot....
This is pretty odd - and I think a bit buggy. Mine did not display the total space either. So I played with the view settings and only when I select the "Tile" option did I see the total space consumed. And very oddly, if an Internet shortcut was included (highlighted) then the total was not displayed. Deselect the Internet shortcut, and the total (less the shortcut) was displayed again. Very odd. So you might try deselecting, or purging any Internet shortcuts first, then see if it works.
I think I will report it to MS. The more that do, the more likely it will be addressed.