XING Help Center
Here you’ll find answers to your questions, and information about XING features. You can also contact the XING Support team (available in English and German) if you need any other assistance.
By the way, we've published some help videos that may be of use to you: Go to videos
How can I view all contacts of my contacts?
The Power Search offers the following option:
Power Search - All contacts of your contacts
You can display all contacts of your contacts at once, provided that this option has been made visible to you by your contacts in their privacy settings.