In Tokyo, there is now a property (glide.knowman.allow_retire_block) to allow knowledge blocks to be retired, even if they are used by articles.

This avoids the common issue of not being able to retire a knowledge block that was used in a previous version of an article (which could no longer be easily edited).

Retire a knowledge block (servicenow.com)

When retiring a knowledge block, you will now see this confirmation message: