To customize a note's display:
Right click on the note's titlebar.
Select Note preferences....
The Local Settings - Knotes dialog will open.
Choose the Display icon from the three icons at the left.
The following choices are available:
The color square shows the current text color. By clicking this color square you open the standard KDE color selection dialog.
The color square shows the current text color.
The width of the note in pixels. Edit this number as desired.
The height of the note in pixels. Edit this number as desired.