I need to remove or cancel a prod version in the "Publishing Overview". I don't need to overwrite it with a new upload.
I went to Google Play Academy and did a course on Managed Publishing. From there this was an FAQ:
So, it seems that any APK will be replaced based on the latest version code. For example, if you have an app in 'Changes ready to publish' (in Publishing overview) with a version code 1 then you can replace said app with version code 2. The latest version will override the one in 'Changes ready to publish' and only version code 2 will ever be published to the Play store.
Reference: https://playacademy.exceedlms.com/student/activity/7035-choose-when-your-app-updates-are-published