Deleting a node removes it from the main window's nodes area. Once it is deleted, you will no longer be able to display the node metrics or run scripts on the node.
Select Delete from the option menu.
Click in the Group field and type the name of the group the node is to be deleted from, or choose the group from the drop-down list. If you choose a group that does not contain the node, the node is not deleted.
Click in the Node field and type the name of the node to be deleted, or choose the node from the drop-down list.
Click on Apply or OK.