Sync has the option to search for folders and shared files, connected devices and users in UI. Sync will show results for matching string. It's case-insensitive.
Search bar for folders/files is located in the Sync Main view:
Searching in Peer list:
Searching in License users:
To perform search in Sync on iOS device, pull down the list of files and see Search box appear. Currently, Search is performed on the given subfolder level though.