Take a look at this screenshot. It's also the standard avalon xml, but I think this one is from an older version, though on my HTPC I got the most up to date version and there is also the percentage visible.
View attachment 93500
Thanks for attaching the picture
I figured it out, For me it only shows percentage when in icon mode, and in that case it shows iit in the middle of the screen, towards the bottom.
I definitly think it's missing in list mode, and perhaps was removed from list mode some point after your screen shot was taken. What's certain is that I have never seen a percentage sign in the top left of my screen in list mode.