Open Settings from the bottom of the app, scroll to DIAGRAM, and flip the Left-Handed toggle on. Tap Save Changes and every chord diagram in Fretscape flips — strings reversed, fret numbering on the right — so the diagram matches a left-handed guitar.

What changes

Two things flip:

• Chord diagrams. On every voicing card, in the voicing details view, and anywhere a small chord chart is shown, the string order reverses. Where right-handed diagrams read low E on the left and high E on the right, left-handed diagrams read high E on the left and low E on the right. The little fret-position number that used to sit on the left of the diagram moves to the right.
• The Reverse Lookup fretboard. The big interactive fretboard in Reverse Lookup flips the same way, so the fret numbers and string labels match what a left-handed player sees on the neck.

That's the only thing it affects. The rest of the app — search results, builder buttons, settings — looks identical.

What it doesn't change

Left-handed mode only changes how the diagram is drawn. The chord itself, the tuning, the search results, the audio, and everything else stay the same — C is still made from C, E, and G; the picture just matches a left-handed neck instead of a right-handed one.

Turning it off

Open Settings, turn Left-Handed back off, and tap Save Changes. Every diagram returns to the right-handed orientation.