IIRC it's usually the neck actor being set to wireframe. So with that actor selected: Display:Object Style:Texture Shaded

If you want to change that in the cr2 the relevant entry is in body part controls of the cr2. Open the cr2 in a text editor and search WIREFRAME. You'll get one result, in the neck actor. Change that displayMode entry to USEPARENT (the display mode styles are always in caps)

Here's the correct nomenclature for internal display styles in Poser...

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