The Shared Configuration File is used to standardize settings (such as markup colors and fonts, measurement units, and so on) when there are multiple users in a common work setting. It stores SpinFire application default settings that are determined by your enterprise SpinFire Ultimate system administrator.
In this type of multi-user installation, only the SpinFire Ultimate system administrator is allowed access to this file; for other users, the option is disabled and will appear grayed out.
See The Viewer Settings Configuration File for more information.