Topic on Help talk:Extension:GlobalPreferences

Local exceptions can be set by checking local exception checkbox in Special:Preferences for each preference that has been made global.

Is there a way to overrule global settings locally? I prefer the English interface for the English Wikipedia and the German one for the German Wikipedia. For everything else I would like to have one of these (doesn't really matter which one). As far as I can see this doesn't work with the new extension - I would have to have the same language in literally every Wiki.

You can override your global language setting. After you set the global preference, visit Special:Preferences on the wiki you would like to change. There will be a check box underneath the language setting to override the global language preference and set the local one. The check box does not appear in Special:Preferences if there is not a global language preference set.

Thanks, that is very useful.