출처 : Using Shape Tools – Figma 

Creating Dashed Lines

1. Draw or select the line you'd like to make dashed.
2. In the Stroke section in the Properties Panel, click the three ellipses to open the Advanced Stroke settings:
3. You can specify both the length the Dashes, as well as the distance between them (Gap). 
4. Enter this in the Dashes field in the following format: Dash, Gap; e.g. to create a dash with a length of 5 px and a gap of 2px, you would enter 5,2.