This plugins adds leveling controls for your CR-10 to the Control tab.
Install via the bundled Plugin Manager or manually using this URL:
https://github.com/electr0sheep/OctoPrint-Cr10_leveling/archive/master.zip
The plugin will look for the leveling controls at OctoPrint boot and add them if it doesn't find them. To disable this checking, simply disable the plugin. No other configuration is necessary.