When you're inside a Folder (Dashboard, View or any Record), two new icons will appear in the Search bar indicating that you'll be searching through both, Gmail emails and NetHunt CRM Records.
The right icon is the Folder name and it narrows down the search only to the current Folder. Delete it to search through all NetHunt CRM Folders.
The blue NetHunt CRM icon lets you search through all NetHunt CRM entries. Delete it to disable the search through Records.
You can create search filters in NetHunt CRM right from the Search bar. This narrows down the search queries and the results can be sorted, grouped and saved as views.
Some of the most useful operators are listed below. The operators can be combined to create complex search queries. All of them are applicable to the Gmail Search bar and to the record creation menu in the inbox.