To disable panel configuration, set the /apps/panel/global/locked_down key to true.
When you disable panel configuration, the following changes occur in the user interface:
The following items are removed from the panel popup menu, and from the drawer popup menu:
The launcher popup menu is disabled.
The following items are removed from the applet popup menu:
The Main Menu popup menu is disabled.
The launcher drag feature is disabled, so that users cannot drag launchers to, or from, panels.
The panel drag feature is disabled, so that users cannot drag panels to new locations.