• I have searched the issue tracker and believe that this is not a duplicate.

Steps to reproduce

Use the new 2.4.0 feature for multiple registries.

pdm config pypi.extra.url https://test.com/simple
pdm config pypi.extra.username "foo"
pdm config pypi.extra.password "password4foo"

The following is added to the config.toml as it should, in my home configuration:

[pypi.extra]
url = "https://registry.com/simple"
username = "foo"
password = "password4foo"

Actual behavior

When running pdm config, the configuration is not visible.

Expected behavior

The configuration should be visible, or at least give a warning that registries configuration are hidden.

Environment Information

PDM version:
  2.4.0

The feature works great nevertheless, thanks for everything!