Go to the look and feel section under the user interface section. In general, if it can't be done through the UI or with a supported plugin you probably don't really need to do it. Any changes you make to source code will need to be maintained and run the risk of Atlassian changing where they do it making reproducing the modification troublesome.
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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