Display additional tags on m4a

[Velociraptor]

I have some m4a audio book files that I would like to add a "series" and "series-part" to.

When I go to "customise columns" and add the series and series-part they do appear as columns, but I am unable to edit the field on any m4a files.

However if I go in to extended tags I am able to create the series and series-part tags and populate them with data. But I am still unable to view these fields on the main panel.

Is it possible to display these and edit them on the main panel?

[ohrenkino]

See the documentation on how to customize file list and/or tag panel:

Customization – Mp3tag Documentation

For more detailed suggestions, please follow

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esp. the part about screenshots.
Screenshots of the settings for file list columns and tag panel fields would help.