skarasuko Thank you very much for your feedback. While it's not an exact match, we have an idea on our roadmap to achieve something similar using slot folders:
EsotericSoftware/spine-editor887
Currently, even if slots are duplicated within the same folder, unfortunately, the animation for changing the folder's display order does not carry over. This may differ from what users generally expect, so we consider it an issue that needs to be addressed.
As you mentioned, an option to specify order relative to a specific slot—such as placing items immediately above or below it—would also be useful. However, for now, improving the folder functionality is likely the most visually intuitive approach.
