Know what you're playing. Always.
Every note shows its degree over the root, not its name. The colour tells its job in the chord:
Same fret, other name: in some chords you will see #9 instead of b3, #11 instead of b5, #5 instead of b13, bb7 instead of 13. The chord decides how the note is spelled.
Chords: a triad or a seventh chord shows as a voicing, the notes you play together, one per string, on four strings (a triad repeats one of its notes to get there). The arrows under the neck move it up through its inversions; the bar says which degree is on top and which in the bass. Play strums them one after another.
Arpeggio, next to Voicings, shows every chord tone across the neck instead, and Play runs through them. On a scale, Triads and 7th chords (in Options) play the arpeggio of every degree, one after another.
Click a fret to hear it · double-click to make it the root.