Sorry, but this is a bug and the answer you gave does not help at all. For some reason, sometimes the grid tab is visible and other times it's not. I've just spent 15 minutes with my developer trying ot fix this. I've updated the share link and it started to work, but then I've updated it again and it stopped working. I've not changed anything withing design options whatsoever, only added a couple of elements on my design. How can this affect the app behavior at all?! It's very inconsistent.