Assuming you are on Cloud, I've just checked and the functionality is still there but there are some prerequisites to allow a user to edit the issue type, the workflows of those issue types need to be the same.
If their workflows are different from the current issue type you'll have to use the "Move" function under the "More" menu.
Hope this helps.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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