Understanding the destination of existing links is unsatisfactorily solved. At present, the link destination is invisible in editing mode (no mouse-over - which is a dangerous thing in itself, because unavailable on touchpad user interfaces). Furthermore, clicking into the link and clicking on the link button (chain symbol) does NOT open the dialog. It seems one has to precisely mark the entire link first, then the link button does show the link destination.
Suggestion: after each link add a little icon which, when clicked, adds a directly editable inline element containing the link destination. No need to go to the top, no no modal popup dialog which has to separately confirmed... The inline link destination should not require closing to accept, it should just be a part of the text and changes to it are naturally saved together with all other text when the page is being saved.