Categories pagination

Hello
I found this code here for divide products in different pages:

// Display 24 products per page. Goes in functions.php
add_filter( ‘loop_shop_per_page’, create_function( ‘$cols’, ‘return 8;’ ), 20 );

It’s working in products, I change it to 8 because it’s what I need. But I don’t know how to make it work for categories and subcategories.

Any help?
Thanks!

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