When creating a new typography, the stroke styles (dashes), that you display by clicking on the Edit button next to Dashes, is empty and it appears as:
Add stroke styles one-by-one.
The procedure is explained in Configure stroke styles in the Stroke styles chapter.
All related topics
Stroke styles (chapter)
Configure stroke styles (procedure)
Creating angled hash stroke styles
Creating straight hash stroke styles
Creating dashed and dotted stroke styles
Working with weight in Dashes editor
Working with space in Dashes editor