To configure the display:
Right click on the panel icon.
Select Preferences...
The KNotes Defaults - 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 background color. By clicking this color square you open the standard KDE color selection dialog.
The width of the note in pixels. Edit this number as desired.
The height of the note in pixels. Edit this number as desired.