If there are no existing views to reference, select <New Drafting View> to create a new drafting view. The reference callout will then point to this new drafting view.

The callout view displays in the drawing area.
If you created a new drafting view for the reference callout, the new view displays in the Project Browser under Views (all)
Drafting Views. Create the drafting view as desired. For instructions, see Drafting Views.