There are three "Creative Cloud Files" folders on my drive...

[#1]

..., one with "(unknown)" and one with "(<email address>)" added on the end of the folder name. The one without an addition to its name seems to be functional (syncs files added to it). Can I delete the others?

[#2 · Accepted solution]

This was a known issue, please see the thread Why do I have 3 'Creative Cloud Files' folders?