push the columns out so the Feature details slideout screen doesn't cover them (Features List view)
Right now you're using a CSS fixed position style, which slides out OVER the x-scrollable feature list. This means when you're looking at the details of the last two columns in the list, the details screen covers the columns, and the only way that you can select the next item is to click close and then click the next one. With your animation, it's a huge waste of time when clicking through your list to check on details.
It would be nicer to users if you made the details screen push the feature list out, so that the right-most columns were viewable. Or, at least have a very visible left/right arrow labeled 'prev/next' so that you could at least avoid the close, wait for animation, click, wait for animation time-consuming cyle. Or have a combo dropdown listing all of the features in that release so you could quickly jump to the desired one.