Nested view plugin have its own search implementation, which can crawl correclty into nested views.
It is targetted to jobs and views, so can do many interesting modifcations like regex or so.
Unluckily, this extension is unable to search in eg settings, nodes or so (enhancement welcomed)
See eg: https://issues.jenkins.io/browse/JENKINS-65924
By this checkbox you can enbale it or disable it.