Client is asking if a user can choose to switch from Dark to Light on any page ?
Incidentally I found it useful to disable the white color CSS for Headings (H1, H2, H3 etc) because it made editing paragraph headings possible in Dark theme. :-)
If you can see why there is no mainmenu showing on English pages it might save me some time.
Update: The 'Start a new project' module has now gone awol in both languages :-(