The Get Info pop-over provides a series of tabs showing information about the currently selected note. Dismiss the pop-over by clicking anywhere outside it. The pop-over will position over the non-active pane of the main window, i.e. the main view or text pane.
Dragging the pop-over will result in a stand-along dialog. This allows the Get Info information to be viewed and used when the source note is no longer selected. It is possible to have multiple Get Info dialogs open at the same time.
The sub-tab selected on first opening will generally default to the last one used in the current session.
For detail about the Get Info sub-tabs, see here.