In Music Stand by WorshipTools, there are various view options you can modify per each song:
To get to these options, open the song from the service setlist and click on the song title at the top of the Music Stand app. This article will walk through the Format Settings.
The Format Settings are available on any song when you're viewing chord charts (excluding PDF files).
Under Format Settings, the Capo option will automatically transpose the original chords of that song to the equivalent chords with a capo on a specified fret. This does not change the key of the song*. Rather, it helps guitarists know, when using a capo, which chords to play to stay in the same key as the rest of the team.
In the example below, Capo is set to "4." The key of the song has not changed from the original key of D, but all the chords have been adjusted to the corresponding chords that would produce the same original key of D when played with a capo on the 4th fret of a guitar.
*The option to change the key of a song is under Song Settings.
Number and Do Re Mi Charts
The Number Chart option changes all the chords in a song to their numeric equivalents. The number system assigns numbers 1 through 7 to the seven chords in a scale. It does not tie a song to any specific key, but rather tells musicians which number chord of any given key to play in the progression. As long as musicians know their keys/scales (and all the relevant sharps and flats), using the number system is a great tool for playing a song and mentally transposing on the fly.
In the example below, the "1" corresponds to the first chord of whatever key the band wants to play the song in. In the original key of D, the "1" would equal the first/tonic chord, which is the D chord. "4," then, corresponds to the fourth chord in the key of D, which is the G chord. So on and so forth. Now, if the band decided to play the song in the key of C instead, the musician would mentally understand that "1" now represents a C chord, and "4" now represents an F chord, and so on.
Similarly, the Do Re Mi option allows musicians to read chords in the equivalent solfege with Do on the "1" (tonic) chord.