You should not be trying to amend the workflow in the workflow designer.
The point of the simplified workflow is that it follows the board columns, and that's where you should be deleting things from.
Trying to edit it that way was an attempt to fix it, but as it hasn't worked, you're going to need to do it the hard way - swap the project over to use another workflow scheme, then re-simplify the project workflow.
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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