The note display is the main zone in the Key Editor. It contains a grid in which note events are shown as boxes.
The width of a box corresponds to the note length. The vertical position of a box corresponds to the note number (pitch), with higher note events higher up in the grid.
Depending on the zoom factor, the note events show the note names.
You can change the naming format and the note names of the pitches in the Pitch Notation section of the Preferences dialog (Event Display—Chords&Pitches page).
You can activate Pitch Visibility On/Off on the Key Editor toolbar, in order to show only the pitches with events or the pitches suggested by the Scale Assistant. This hides the keyboard keys whose pitches are not used and displays note names on the remaining keys.