'Category in home page

I'm a beginner with editing wordpress / woocommerce themes. I have a problem with categories, I would like to set 5 categories in line not 4 + 1.

Theme installed: Storefront Version: 3.9.1

I kindly ask you to explain step by step where to make the changes.

Solution 1:^[1]

I don't think this question its related with programming.

Just add "5" into the Category settings (Products by Row).

Before:

After:

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Solution	Source
Solution 1	Syntax_Error