In order to enable Magento 2 Dynamic Categories Extension navigate to Stores > Configuration > Magefan Extensions > Dynamic Category.

General Configuration

1. Enable the extension in order to be able to create dynamic categories.

2. Enter the Product Key which you can find in your Magefan Account > My Downloads.

3. Enable the Use MSI option if you want to use the Multi-Source Inventory on your store.

Magento 2 dynamic category configuration

Once you've finished don't forget to press the Save Config button.