I think you are saying the "Library" Icon in the toolbar is cryptic? (I'm guessing because it does have three lines...).
There are two other ways to get to the Snagit:Mac Library: 1. Context click on any capture in the tray and select "Reveal in Library" -or- 2. Select "Switch to Library" from the "View" menu. (which has the shortcut: cmd-1)
If either of those solutions are more to your liking you could then select View->Customize Toolbar and completely remove the cryptic "Library" icon from your toolbar. (and maybe put something you use more often in its place)