surface wireframe drop down

Hi @defaultnvnri8ki5xbn,

We are sorry for the trouble. In addition to @Ton Frederiks suggestion, you may try the following steps:

• Reset Illustrator Preferences (https://helpx.adobe.com/illustrator/using/setting-preferences.html) 
  Disclaimer: Please note that resetting preferences will remove all the custom settings, and Illustrator will launch with default settings. You can also take a backup of the folders in case you want to. Location is mentioned in the article.
• Rename the CEP folder to CEP.old from the following location:
  MAC: /Library/Application Support/Adobe
  Windows: C:\Program Files (x86)\Common Files\Adobe
• If that doesn't help, rename the UXP folder to UXP.old from the following locations:
  MAC: /Library/Application Support/Adobe
  MAC: ~/Library/Application Support/Adobe
  Windows: C:\Program Files\Common Files\Adobe\
  Windows: C:\Program Files (x86)\Common Files\Adobe
• If that doesn't help either, uninstall the application using the CC Cleaner tool and reinstall it from the Creative Cloud Desktop app.

Kindly update the discussion if you still need assistance with it. We'd be happy to help.

Thanks & Regards,

Anshul Saini

The new 3D and Materials do not have a wireframe option.

You can still use the Classic option: