Where has the ability to view and update issue workflows in Jira gone?
I have never before seen such a great example of a fantastic product being utterly destroyed by a simple interface revamp. It really didn't need doing, and now everyone's favourite bug tracker is basically unusable.
Please, just put it back to how it was, and leave it alone.
To update the workflow first you should have jira administrator rights if you have then Admin --> Issues --> Workflow
Find the workflow and Edit, change as you want and then publish the workflow.
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