Why can't I use the 'Isolate Elements' feature?
To be able to use this feature, it is mandatory to verify either your Revit export / Navisworks import settings. The option 'Convert Element Properties' has to be checked prior to the export/import. Please note that this option is not checked by default so these step might be required. See below for detailed procedures.
Exporting NWC files from Revit:
Open Revit menu, select 'Export' and NWC format.
Open the 'Navisworks settins' menu.
Make sure that the 'Convert Element Properties' option is checked.
Importing RVT file from Navisworks:
Open Navisworks menu and select 'Options'.
Expend the 'File Readers' menu located on the left hand side. Select 'Revit' from the list and make sure that the 'Convert Element Properties' option is checked.
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