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Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Manage apps → Custom attributes schema.
Locate needed attribute → Actions → Remove attribute. → Click Confirm.
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...
Log in as a user with the 'Jira Administrators' global permission.
Navigate to Admin menu → Manage apps → Custom attributes schema.
Locate needed attribute → Actions → Remove attribute. → Click Confirm.
...