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, either whole words or the last syllables in multi-syllabic words, 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.