The only things that control the assignee field in JIRA is whether it's on-screen and if you have "assign user" permission, not to be confused with "can be an assignee" (you can do more with some add-ons - field security for example)
Permissions can be quite complex, so
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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