RegistryUI Documentation
Remove Folder
A folder can be removed using the Repositories, Projects and Tags Explorer. When a folder is removed, all sub-projects and their images/tags are removed.
Folder removal is a background process which may take a while depending on the number of images and sub-projects being removed. While a folder is being removed, it may still be displayed when using the Repositories, Projects and Tags Explorer. In this case, "(deleting...)" is shown next to the folder name.