Nothing has changed in calibre, the device or the Kobo Utilities plugin that would mean the titles would not show up if they were before.
The device reads the titles from the metadata in the books. Calibre will update the metadata when you send the book to the device. If you library shows the correct title, then the device should see it. You can change the title using a metadata plugboard. If that is not correct, then it could be setting the title incorrectly. That is probably the first place to look.
You could also open the book on the device after sending it and before disconnecting the device and see what the metadata is.
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