Turning model lines black in HLR render, Creo View Express

I want to view a model as a wire frame with hidden lines in Creo View Express, but with black lines rather than the kaleidoscope of colours the model is in when I open it in Creo View Express.

I've tried following the instructions on this help page:

https://support.ptc.com/help/creo/view/r9.0/en/index.html#page/creo_view/visualization/shared/To_Edit_Color.html#wwID0ECMGS 

I've selected everything in the model .

A Model Parts tab appears on the ribbon, but there's no Color tool on the toolbar.

The model I'm opening comes as an edz file.