Go to the CC website and log in: https://creativecloud.adobe.com/
Click on Your Work on the top of the page, then click on Files if necessary.
Look for the shared folder and re-select the Invite menu.
You will see the persons you previously shared the folder to.
Click in the permissions menu and select Remove.
Then click Save
Thanks for reaching out. In addition to the information shared earlier, I'd also request checking out this help article to know how to stop sharing public links to your Creative Cloud files and folders.
Hope it helps.