What I did: After a migration from cloud to dropbox back to cloud (bad idea now I know that), and moving some things around, eventually, I could not remove 3 categories that seem clearly broken and cannot be removed.
What I have tried: When I right click on the name, it provides me a pop-up menu with option to delete but does nothing upon clicking delete. When I click the 3 dots menu on the right, a 10px height, 300px width arrow-left white menu rounded on the right pops up with no contents.
Any ideas how to remove these?