This is not working in the Beta yet, as mentioned in the Known Issues section at the Beta Page:
[url]Scrivener 3.0 Beta - Release Candidate 10 (Download Links & Change List)]
Known Issues
We are still implementing features and ironing out bugs, so you should expect to find things that aren’t working quite as intended. A few issues to be aware of in the current 2.9.0.4 beta:
- When inline or linked notations/footnotes are included in a selection and the selection does not span the entire paragraph, setting No Style (or Remove Style) will strip the linked notation and lose the annotation/footnote formatting of the inline notes unless all text in the selection had a character style applied.
- Though we have the interface set up for the new compiler, it is not yet fully functional.
- Documents in Scrivenings mode cannot currently be edited. - There is currently a display bug we are still working to fix whereby text in one editor may temporarily disappear after loading or adjusting the text display in a different editor. Resizing the editor will cause the text to reappear.
- Project templates have not yet been updated for 3.0, so are not taking advantage of new features and may have some outdated content.
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L&L is trying to get this implemented in the next Beta release (May 31): [url]When can we expect Scrivenings Mode to work? - #7 by MimeticMouton]