You are mentioning two different concepts
Ghostnotes are painted positions of one block-content in all other blocks. That is yet not part of off. 1.2.2
It will be in next release.
Scale-enhancement is markings, that shows all notes in a scale, in all blocks. That is a feature in LMMS!
read about how you use that:
https://lmms.io/wiki/index.php?title=Pi ... or#Editing
Specifically section LMMS-Scale-annotation