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is it possible in Magento 2 to randomly show the products on a category page, like everytime the page is opened, random products are shown?

Thanks!

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To achieve this you have to override the catelog_category_view.xml

And Change Block of getting listing of product collection.

<block class="Magento\Catalog\Block\Product\ListProduct" name="category.products.list" as="product_list" template="Magento_Catalog::product/list.phtml">

Change class from Magento\Catalog\Block\Product\ListProduct to Magento\Catalog\Block\Product\ProductList\Random like below i have updated.

<block class="Magento\Catalog\Block\Product\ProductList\Random" name="category.products.list" as="product_list" template="Magento_Catalog::product/list.phtml">

After that make preference for _getProductCollection() for getting current category product like below.

/**
     * @return \Magento\Catalog\Model\ResourceModel\Product\Collection
     */
    protected function _getProductCollection()
    {
        if ($this->_productCollection === null) {
            /** @var \Magento\Catalog\Model\ResourceModel\Product\Collection $collection */
            $collection = $this->_productCollectionFactory->create();
            $collection->addCategoriesFilter(['in' => <<Category Id for getting current category product>>]);
            $this->_catalogLayer->prepareProductCollection($collection);
            $collection->getSelect()->order('rand()');
            $collection->addStoreFilter();
            $numProducts = $this->getNumProducts() ? $this->getNumProducts() : 0;
            $collection->setPage(1, $numProducts);

            $this->_productCollection = $collection;
        }
        return $this->_productCollection;
    }

After that clear cache and check you getting product collection randomly. Still if you have any query let me know.

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