How to organize scripts into folders

Create: in the sidebar, click the "+" next to the "Library" heading ("New folder"), type a name, press Enter.

Move a script in: on the dashboard, open the script's three-dot menu ("Script options") and under "Move to" pick the folder (or "No folder" to take it out). There is no drag-and-drop.

Rename, change the icon, or delete: hover the folder in the sidebar, click its "…" button, then "Rename", "Change icon…", or "Delete folder". Deleting a folder does not delete its scripts; they move to "No folder".

A folder's icon also shows on any script inside it that has no icon of its own.