Sometimes it is helpful to give players multiple consecutive cues so they can follow passages of music more easily. Dorico Pro allows cues to overlap in order to give you flexibility over how to give useful information in cues to players.
However, the stem directions of cues are not automatically adjusted when they exist at the same rhythmic position as other cues. For example, if you want to show a melody passing from Violin 1 to Violin 2 that requires the two cues to overlap, and both instruments are shown in up-stem voices by default, then the two cues appear with up-stem notes.
You can override the default stem directions of cues individually to make overlapping cues easier to read.
You cannot input multiple cues at the same rhythmic position. However, you can input cues at different rhythmic positions, then move or lengthen/shorten them so they overlap.