Hi,
I recognize your problem, and it won't work in Notion (6.8.2..), because this program is not a really extensive "graphic notation program"). There are simple programs such as Encore 5 that can solve this problem very easily.
(ps.Notion is more for the good sound of how the piece should sound, than for the layout).
(it would be better for you, add a stave and divide the guitar parts over 2 staves (just like for a piano!)
Success with it,
Greetings HarryM.