The issue type is a defining property of an issue, it makes no sense to have something that is a "bug" and an "improvement" at the same time, it's one or the other.
So, no. You can only give an issue one type.
You can have many types in a project of course, just check the "issue type scheme" for 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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