After upgrading to 8.6 you can't view many of the previously seen filters under Manage > Computers. They are seen under Manage > Filters
Release: ITMS 8.6
Component: ITMS Management Views
The filters are hidden.
While in Manage > Computers, right-click in the white space in the Filters section and select Show/Hide Filters. Select the desired folders to show the folder and the filters it contains, and click OK.