You can disable a tool if you want to prevent sites from installing it. There are two ways to disable a tool:
When you disable a tool at the site level, you prevent the site from installing it. When you disable a tool at the system level, you prevent all sites from installing it.
When you disable a tool, existing installations are not affected. You cannot remove site installations from the Server Administrator control panel; existing installations can be removed only from the Site Administrator control panel.
To disable a tool at the site level:
The tool is no longer available to the site through the Site Administrator control panel. However, the existing installations are not affected.
To disable the tool at the system level:
The tool is no longer available to any site through the Site Administrator control panel. However, the existing installations of the tool are not affected.