You’ll be able to control column count and button heights of Fast Menus.
After selecting a category as Fast Menu you can Button Height and Column Count settings works for fast menu section.
This is how it appears when I set button height as 100 and Column Count as 4.
That produces a giant Fast Menu section. I’ve highlighted Fast Menu area with yellow.
Since I have 8 buttons under this category, setting Column Count as 4 will display 2 rows. In other words set this value as how many buttons you want to see on each row.