@Kovid - should the Toc Edit window be the same size if its invoked from the Book List and Editor - because its not.
I think the one that's used when the ToC Editor is invoked from Book List is defined by - 'toc_editor_window_geom' in gui.json - I couldn't find another one.
If I stop calibre, delete that entry, run calibre and open the ToC Editor from the book list I get a very large window
If I resize it, and exit the ToC editor and calibre gracefully, the toc_editor_window_geom entry is not written to gui.json, so when I start calibre and open the ToC editor its still a very large window
Added : Changing
Adjust for high resolution screens : from Automatic to Off had no effect
BR