How to change dawn blogs to 3 across instead of 2 in dawn ver. 9

Store Design
1

The new ver. 9 of the Dawn theme continues to only offer 2 across on the grid for blogs. The code fix for ver. 8 no longer functions.

How do I change the grid to 3 blogs across for Dawn ver. 9.

Thank You.

2

HI @LucyBarker ,

Can you share your store url