Sticky notes have been introduced in version 5.0.7 and updated in version 5.4.
These notes can be used for commenting your graph and for graphically highlighting groups of nodes.
As of version 8.0, you have now different options for automatically aligning your notes.
The reference for the alignment is the note associated with the contextual menu.
Clicking allows setting the default values. These values can be edited via the Preferences | Display | Note
When using the Rendering Properties wizard, the entire set of properties are set to the selected notes. If you just want to change one property without modifying the other ones, choose the corresponding property in the menu.