I have a docker container running Kibana version 7.8.0 and don't seem to have the ability to create a Drilldown in my dashboard. Here's an image showing the issue:
Is this something that's not available (yet) in the docker image?
Welcome to our community! 
Are you using the default docker image?
Thank you for the welcome! And yes, it's the default docker image:
docker.elastic.co/kibana/kibana:7.8.0
Could be because the dashboard does not have a meaningul aggregate to drilldown to? or the dataset does not have the linking column to drilldown to?
It works flawlessly for all my dashboards....
You were absolutely right. I had only been trying this with one of our visualizations and not the other. The other visualization that is a Data Table has the drilldown option so it must be due to either a lack of aggregates or column links.