Begin with the underlying triad
Play C major as C, E, and G. Add B to create C major seventh, commonly written Cmaj7. Replace B with B flat to create C dominant seventh, commonly written C7. The small visual difference creates a different harmonic sound. Now lower E to E flat while keeping B flat to obtain C minor seventh, written Cm7. Play each version slowly and name the changed notes. This comparison is more reliable than assuming every chord with a seven in its symbol uses the same interval structure.
Spread the notes comfortably
You do not need to hold all four notes in one strained hand shape. Play the root in the left hand and the remaining notes in a comfortable right-hand position. Listen especially to the third and seventh, which communicate much of the chord's quality. Keep the sound clean before adding pedal. Move between two seventh chords using nearby notes where practical, and release any stretch that feels uncomfortable. A different inversion or divided-hands voicing can preserve the harmony while making the movement much easier.
Hear the chord in context
Try G7 followed by C and listen to the sense of arrival. Then compare Cmaj7 with a plain C triad under a gentle melody of your own. The added note is a color, not an automatic improvement. When a detected AudioChords label includes a seventh, check whether you can hear that note or whether a simpler accompaniment better suits your arrangement. Practice the full symbol slowly before deciding to simplify it. Knowing what you are leaving out lets you make a deliberate musical choice rather than treating unfamiliar notation as something to ignore.