You should be able to simply enter the letters am7

You can also use the chord builder to enter pre-defined chords (right-click and select Chord Builder).

You can change the appearance from the Display Options page:

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BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones