Apply a Theme to a Space
What is the global look and feel?
When a new space is created, whichever theme is applied to the whole site will be applied by default to the new space. This is the global look and feel, and any changes made globally will flow through to all spaces that inherit the global look and feel.
If a space has its own theme applied, or if changes have been made to customize the look and feel of the space, it will no longer inherit changes from the global look and feel.
If you want to go back to inheriting the global look and feel choose Global look and feel from the Themes page.