https://confluence.atlassian.com/jirasoftwarecloud/advanced-searching-fields-reference-764478339.html . The fields names do not match many of the actual fields shown when looking at a JIRA. Where is the search builder page that looks like the blank Create a new JIRA Issue page??????
When looking at the advanced searching view, click on "Basic" on the right hand side. If it is grayed out, try searching for all tickets (just a blank line) and that should allow you to switch back to basic view.
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