Change pointer based on the context
@mvaradi said: "When going one level below the main (i.e. clicking on something that is part of the ligand), it would be nice to have a quick and obvious way of going back. It was not clear to me that the home button would do the trick. I also didn't know what happened when I suddenly got down to the sub-level after merrily clicking around :) (I.e. I first clicked nodes that didn't take me anywhere, and then suddenly I clicked on a node that did, and I was like "damn, how do I get back")"