Lyric hyphens and lyric extender lines
Lyric hyphens indicate that individual lyrics are syllables within multi-syllabic words, for example, Hal-le-lu-jah. Lyric extender lines indicate that individual lyrics extend across multiple notes.
Dorico Elements automatically inputs and positions lyric hyphens when you advance the lyrics popover by pressing - between syllables, and lyric extender lines when you advance the lyrics popover by pressing Space multiple times after an entry.