1. Open an Editor window.
2. Enable the Navigator panel (if it's not already enabled). To do this, right click in Editor | Desktop | Navigator. This should display to the left of the editor.
3. Right click in the Navigator and choose "Navigator Options".
4. Go to the "PL/SQL Elements" tab and check the items you want displayed.
These settings control the Editor's navigator and the Schema Browser's navigator for pl/sql objects.