In the Navigation Pane, click Grammar, and then click Environments.
In the Environments pane, select the environment you will delete, and then do one of the following:
On the Standard toolbar, click
.On the Edit menu, click Delete Environment.
Right-click that environment, and then select Delete Selected Environment.
The Delete Environment warning box appears and asks if you want to continue with the deletion.
If you are sure you want to delete the environment specified in the warning box, click Delete.
The specified environment is deleted.