Preferences > Behavior page > How to (behavior) >
How to: set system tray icon double click behavior
Right click on program icon appears in system notification area and choose "Preferences" menu item from pop-up menu or click on button on PNotes Control Panel.
When "Preferences" dialog appears, choose "Behavior" page.
By default, when you double click on program's tray icon a new note is created. You may change the response of tray icon to double click by choosing one of available actions in combo box:
Default value: new note.