Craft categories

gistfile1.txt

{% set props = {
    categories: props.categories.all() ??? null
} %}

{% set selectedCategories = props.categories %}
{# {% dd selectedCategories %} #}
{% set leafCategories = selectedCategories|filter(
    category => selectedCategories|filter(current => category.isAncestorOf(current)) is empty
) %}
{# {% dd leafCategories %} #}
{% set products = craft.entries.section('products').relatedTo(leafCategories).all() %}