Whether other collaborator can see other collaborators

Hi there, 

Welcome to Box Community and glad to assist! 

Yes, collaborators can find out which other users are invited to the folder in which they are in. If you prefer to keep it private for these individuals, you may setup hiding collaborators.

Here's the steps to hide collaborators:

1. Right-click the folder (or click the ellipsis (...)) to open the More Options menu.
2. Click Settings to open Folder Settings.
3. In the Privacy section, check the box next to Hide collaborators and their activity from non-owners.

Note: Co-Owners will be able to see all collaborators in the folder. 

Hope it helps!