Currently, we have an option to display note icons on thoughts. However, the icons are non-functional; they simply alert you to the fact that a note exists.
It would be better if positioning the mouse pointer over the note icon would display the note content in a tooltip-style window.
Even better if you could double-click on the icon to open a mini note editor in a popup window. This would make it much more practical to use TheBrain in a non-maximized view and would eliminate the need to constantly slide the note panel open and closed.