Quantity of products per page

Hello
Form where can I manage quantity of products per page?
Please check the link

https://share.getcloudapp.com/7Kub5JyW

it's a setting for each category: https://docs.nopcommerce.com/en/running-your-store/catalog/categories.html

Select the Allow customers to select page size checkbox, to enable customers to select a page size, i.e. the number of products displayed on the category details page. The page size can be selected by customers from the page sizes list entered by the store owner in the Page size options field.

    In the previous checkbox is ticked the Page size options is displayed. Enter a comma separated list of page size options (e.g. 10, 5, 15, 20). First option is the default page size if none are selected.