Changing note size for voice 2 only

Hello,
I have read the forum here, and learned how to use voice 2 to handle situations where there are small differences in notation between verses of a song. For example, I am working on a score where an 8th note in verse 1 needs to be played as two 16th notes in verse 2. I was able to add voice 2 to only the measure where this change is needed (I could not figure out how to just change the affected notes, so I have a full measure of voice 2), but I now want to make only the voice 2 notes smaller. When I follow the instructions that I found for changing the size of notes in a measure, both voices are converted to the small size. How do I select only the voice 2 notes to change their size, while leaving voice 1 alone? Note that the only difference between the two voices in this measure is the notation on that one half-beat. All other notes are identical.

Also, while I'm at it, the reason for this change is that the verse 2 lyrics need the two 16th notes, as there is an extra syllable in that part of the verse. When I try to edit the verse 2 lyrics, the program ignores the 16th notes and I cannot enter the verse 2 lyrics at that point as two syllables across the two notes. It seems to default to the verse 1 structure. Is there a way around this, or some way to include a "hard" hyphen within the lyrics so it will look correct when printed?