You can't - Jira diesn't do field level security. https://jira.atlassian.com/browse/jra-1330
The two standard workarounds are the Quisapps field security plugin, or moving the field off the "edit" screen and into "transitions" only, so you can control who can get to edit it.
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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