Install add-on Service Pack for JIRA Service Desk. Once done, go to Workflow Actions section in your administrator screen, select a Technical User.
Go to workflow transition properties. In your case, this will be Resolve transition and add the following property:
Atlassian customized their instance, see the comments in the issue: https://jira.atlassian.com/browse/JSD-40?focusedCommentId=541059&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-541059. There is a (paid) addon which can take care of this: https://marketplace.atlassian.com/plugins/com.intenso.jira.plugins.jsd-extender.
...be more productive while being fun to use at the same time. For some, getting started can be a bit intimidating. This is especially true if Jira Service Desk is your first exposure to Atlassian...
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