The four subdrills of the Chord Elements drill are Thirds, Chord Tones, Chords, and Notes.

This subdrill teaches you to identify intervals of major and minor thirds, whose arrangement within a chord determines whether the chord is major, minor, diminished, or augmented.
Each of these three subdrills focuses on a different aspect of roots, thirds, fifths, and sevenths. Chord inversions are identified by determining whether the lowest note of the chord is the root, third, fifth, or seventh. These subdrills are essential for identifying chord inversions quickly.
The following items modify the current subdrill.
All chords will be triads. This item is disabled in the Thirds subdrill.
All chords will be seventh chords. This item is disabled in the Thirds subdrill.
All chords will appear in root position. In root position, the root is always the lowest pitch in the chord.
All chords will appear in first inversion. In first inversion, the third is always the lowest pitch in the chord.
All chords will appear in second inversion. In second inversion, the fifth is always the lowest pitch in the chord.
All chords will appear in third inversion. In third inversion, the seventh is always the lowest pitch in the chord. Third inversion applies only to seventh chords, and is enabled only if the Seventh Chords option is in effect.
The program will use all inversions.
This command opens the Triad (or Seventh Chord) Inversions dialog box, where you can choose the inversions you want to use.