According to the docs for searchbnf.conf, setting the shortdesc field to a value will make it so that the description field only appears when the search assistant is set to "Full" mode. https://docs.splunk.com/Documentation/Splunk/9.2.1/Admin/Searchbnfconf If you would like description to always appear in that window, and it is not too long, then you could comment out the shortdesc field. Or you could set your user preference so that the Search assistant is in "Full" mode. (User "Preferences"->"SPL Editor"->"Search assistant". It defaults to "Compact")
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