Add key and value to an array in another file

I tried another solution and that did the trick. I found in the WooCommerce docs this little snippet:

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

It is overriding the settings in the customizer. I only have to change the number ’24’ to my liking.

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