add-link/remove-link buttons had greater functionality that is now lost in S4

From Adam Lobel:

This doesn’t feel like a bug but rather a brain cramp on my part but in Stacks 3 there was a Link and an Unlink button when adding a link to an image. Now all is see is one button that is either Link (if there is not a link associated with an image) or Unlink (if there is already a link enabled). But what if I just want to look at or change an existing link. Unless I’m screwing something up (quite possible) my only option seems to be to hit the Unlink button and then start from scratch? Clearly I’m missing a step. Any thoughts? Thanks and sorry if this is obvious.