1
Create a file in the theme along the path app/design/frontend/Vendor/theme/Magento_Catalog/layout/catalog_category_view.xml
Add there
<?xml version="1.0"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/...
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