If you are an administrator, you can do it as mentioned here: https://confluence.atlassian.com/adminjiracloud/adding-editing-and-deleting-an-issue-type-844500747.html
Make sure you migrate the existing issues to other issuetypes before you delete.
Hey everyone! My name is Sarah Schuster, and I'm a Customer Success Manager in Atlassian specializing in Jira Software Cloud. Over the next few weeks I will be posting discussion topics (8 total) to ...
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