Vocabulary toolbar
When the Vocabulary editor is active, its tools are added to the toolbar, as shown:
The Vocabulary tools provide the same functions as the corresponding Vocabulary menu commands:

Vocabulary >
Add Domain.

Vocabulary >
Add Entity.

Vocabulary >
Add Attribute.

Vocabulary >
Add Association.

Vocabulary >
Show Vocabulary Details Vocabulary >
Hide Vocabulary Details - Toggles the associated Vocabulary to show or hide details.