Show More Data with 12-Column Dashboards
Where: This change applies to Lightning Experience in Professional, Enterprise, Performance, Unlimited, and Developer editions.
Why: More columns and shorter rows means more components and more layout options in the same space.
How: To switch between 12 and 9 columns, create or edit a dashboard. Open the dashboard properties by clicking the properties icon (). From the Dashboard Grid Size section of the properties window, choose 12 columns or 9 columns.