How to eliminate the divisi and recover all the voices, since the second voice disappears.
Thank you

Right click—Divisi—Restore Unison. It’s best to manage divisi in Galley View.

but the second voice disappears

Is this Divisi? I can’t see any signposts. Are these two separate Players in the same part Layout, or two instruments on the same Player, or…?

Do you want to condense the two staves into one?

I send this file
Divisi.zip (670 KB)

Select everything in the lower divisi, then right click in the upper staff, paste special > paste into new downstem voice.

Then remove the divisi