Much like Plugins feature, you have finer control over the WordPress themes installed on your sites.
To see the state of each of your themes on all of your sites, simply load "Manage My Themes" option from the "Themes" section:
To get started with themes managing, sort your themes by name, or by site and then perform one of the following actions (if necessary):
- Sorted by theme - update, activate or uninstall
- Sorted by site - update, install, install (+ activate), activate or uninstall