I had the Adobe LR and LRClassic with 1TB installed. I have fallen back to the LR (cloud only) subscription and need to delete all remnants of the Classic install, including its photographs and support files. I deleted the Classic installation with Adobe's delete function when changing plans. Now I have all these files and I don't know which I can delete. Can someone help with this?
You can delete the first folder, called 'Lightroom'. That folder only contains old Lightroom Classic files. Do not delete anything else. Your screenshot does not seem to show any folder with the original Lightroom Classic photos, however. It could be 'Lightroom Saved Photos', but that seems empty except for the 'Small B&W' subfolder.