Hi - when they changed the viewer from Flash to HTML5, they did not bring the different comments views like All Open. (I do admit it has been a little annoying).
The compromise we came up with (which seems to be working) is that the Account person will put an action on everything (we have STET and To Do). The designer will then filter to only see the To Do's, but has to click on each comment to see the full thing. The good news is, once they open one comment, they just need to hit the down arrow on their keyboard to jump to the next one.
It isn't perfect, but so far seems to be working.