In the main page of the Refined Administration you'll find the Configuration tab. In this tab you'll make settings that apply globally to you Confluence.
Go to: Access it through the admin section of Confluence under the Refined Configuration, or directly from the settings cog.
On this page
What's what in the Configuration page?
Settings that are applied in the Theme Configuration are applied globally, meaning that they will apply to any site or any category in your Confluence.
To learn more about a setting, hover it and click the information icon on each setting.