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Jira has a small number of commonly edited advanced configuration options, which are stored in the Jira database. These options can be accessed and edited from the Advanced Settings page.
Editing Jira's advanced settings
Choose > System
Choose General configuration and click Advanced Settings.
Edit the value of a Key by clicking its value on the right of the page. The table below has extended information on some of the Key values.
Specifying no value prevents a prefix being added to the 'Summary' field of cloned issues.
4. Click Update. Any changes you make to these properties/keys become effective immediately.