The last item of the Unicode range combobox is called Favorites. It can be used to select and display a custom palette of up to 256 characters. This palette is populated by right-clicking on a character and by choosing the " " item in the following menu:
Copy to the clipboard the character upon which the user has right-clicked.
Add to the Favorites palette the character upon which the user has right-clicked.
Remove from the Favorites palette the character upon which the user has right-clicked.
A quick way to switch to the Favorites palette.