If you change the font in a song, you might cause the chords to shift because of differing character widths in the new font. The program will offer to maintain the chord positions for you, whenever the font change exceeds about 10% of the song contents. This will take a few seconds to complete, as the software must calculate the widths and locations of every chord in the song, and every word in the song, and rearrange spaces and tabs to maintain the relative positions of chords-to-lyrics. Some minor shifting may occur, and is unavoidable, within the width of a single space, because spaces are used to reposition the chords.