You should review What is a publication?.
Then, do these steps:
In the Navigation Pane, click Lexicon, and then click Dictionary.
Click the right menu button () on the Information bar, and then select
() a dictionary view.
Click the left menu button () on the Information bar to select a publication.
Alternatively, choose a dictionary view.
The view affects what you see in Dictionary, the Dictionary preview pane, and the Dictionary Entry dialog box.
When you Configure Headword numbers, the configuration is for the current view only.