Creating a custom "Composer" column in Windows Media Player on a PC (Windows 11) is not directly supported, as Windows Media Player does not provide an option to create new columns. The available columns are predefined by the application, and users can only choose from those existing options to display in their library view.
If you want to display composer information, ensure that your media files have the composer metadata filled in. Windows Media Player will automatically display this information in the existing "Composer" column if it is available in the metadata of the media files. You can edit the metadata using a media tagging tool or directly within Windows Media Player by right-clicking on the media file and selecting "Edit" to update the details.
For more advanced features or customization, you might consider using other media player applications that offer more flexibility in terms of library management and column customization.