Add Related Cases to Lightning Knowledge Articles

In order to add the related list of related Cases to Knowledge articles, navigate to Knowledge Settings and select the "Enable list of cases linked to an article" preference in the "Case Settings" section.  Note: Although the option says "Classic Only," it is valid for both Lightning and Classic.

Once the preference is enabled, Edit the desired Knowledge page layouts and add the "Cases" related list.
 

Note: If a knowledge article has more than 2000 cases attached and we try to sort the case-related list, we will not get the expected results after sorting.
The list will sort the records from the existing 2000 records only. This is a limitation of the case-related list on the knowledge object. You can create a report to view the expected cases attached to an article.