Just to check what you currently have:
You are using the metadata plugin so that that your books on you Kobo Glo have the series info in the title of the book.
You now want to move to just title and just have the Glo show the series info in the list.
If that is correct, then you need to:
- In the device driver configuration, make sure the "Set series information" option is selected.
- Remove the metadata plugboard.
After this, on the next connection to the Glo, calibre will set the series info on the device for all books already on the device. And when you send a new book to the device, the title won't be altered.
To fix the title for the books already on the device, you will need to use my
Kobo Utilities plugin to fix the titles. After installing the plugin, select the books that need to have their title fixed and use the "Update the metadata in device library" to set this and any other metadata that you need to change.