Open any form in a Base file. Click on a field. Navigation bar will be shown at the bottom. There will be 4 Filter symbols: AutoFilter, ApplyFilter, Form-BasedFilters and ResetFiter/Sort. StandardFilter won't be available here. Press Data Source as Table. StandardFilter is available. Same with a navigationbar, which is create as a form control. There is no possibility to add these filter to the navigation bar, because it isn't available through customize - toolbars.