Dragging the background of the hyperbolic view moves all the notes, letting you examine different parts of the link structure.
Clicking a note selects that note in the tab's text pane. Selecting a note in Hyperbolic View will move that note to the centre of the view, leaving the tree unchanged. depending on the view's complexity, it may appears to change bit this simply reflects the re-centring of the view.
Double-clicking a note makes that note the view's focus note and will recompute the structure of the document based on that note. This may change which links are primary and which are considered cross-links.
To take select a note and take focus needs a click followed by a double-click.
A context menu for the selected allows traversal from the selected note using any outbound basic or text link. The destination note is selected but does not take focus.