@Kovid - the settings shown below have been as you see them 'forever', unsurprisingly I have never seen any calibre O/S level notifications.
I just checked "
Enable system tray icon (needs restart)", leaving the "
Disable notifications in system tray" unchecked and did a conversion, and I got a notify messages when it started and another when it finished.
Then I checked "
Disable notifications in system tray" and re-did the conversion, and I did NOT any notification messages.
Which suggests the Disable notifications setting is still dependent on the System Tray setting - on Windows 10 at least. Which is fine by me, because I don't want calibre in the tray, nor do I particular want the notify messages.
BR