FYI – I use this to manage special wordings of chapter titles for ToC’s and running footers. I put a textbox above the chapter title, and insert the re-worded text, in a “ghost” style, with red text so it’s easy to spot. Then I set the idiotically located no print checkbox. BUT — if you happen to have Overprint Preview turned on, the red text disappears, so in Preview mode there’s no sign of its existence. So I have to remember to keep Overprint Preview turned off if I need to check on these ghostly reworded titles.
I guess I should submit a user voice request to put a Non-Printing checkbox in the paragraph stylesheet.
When using this trick for specially-worded running heads or footers, it’s also a great way to SUPPRESS the head or footer. You can’t leave the ghost style without content, though, and spaces don’t work — the previous chapter title will persist. However, I found that a discretionary hyphen is both invisible and counts as content, blanking the head or footer until the next instance of the ghost style.