Enable or Disable Extensions

Whether or not the X server supports extensions sometimes affects client behavior. Clients may paint better, run faster, or avoid other problems by changing which extensions are enabled.

To enable or disable extensions from X Manager or the Administrative Console

(Administrative Console only) Click the Domain Definitions tab.
Under Session Definitions on the left, select a session definition.
Click the Extensions tab.
In the Available Extensions list, select or clear extensions as required.