ClientConfig has a few settings that allow you to change its behaviour. These are available under System > System Settings in the clientconfig namespace.
Admin Groups (
A comma separated list of user groups that are authorized to access the admin area of ClientConfig where the groups and fields can be set up.
Clear Cache (
When enabled, the MODX Resource cache will be cleared whenever a change is made to the values in ClientConfig.
Vertical Tabs (
Enable to use a TV-like vertical tab system instead of horizontal tabs for the groups.
Google Fonts API Key (
When using the Google Font List field type, you'll need to set up an API Key to use here.