I've spoken to Adobe support who have informed me there is no way to turn it off and to request the feature in a new version.
BUT.... I think I have found a way to do what I'm looking for. Watch this space...
Hi @Reddwarfposse5 ,
Thank you for reaching out. Currently, it is not possible to completely disable access to Creative Cloud storage through the Adobe Admin Console. However, as an administrator, you can create a custom package with the "Enable File Sync" option unchecked and deploy it to user machines. For more detailed instructions on creating custom packages, please refer to the following documentation: Customize Creative Cloud Apps.
Additionally, blocking specific URLs via your firewall can restrict users from accessing Adobe Creative Cloud storage through a web browser. For a list of network endpoints that should be blocked, please refer to the relevant documentation for network endpoints.
You also mentioned having found a potential workaround. Could you please share the details here? It would be greatly appreciated by fellow community members who may benefit from your solution.
Regards,
AN