I’m using the Desmos API to visualise some data from an application I’m testing. I have a fair number of formulas that I’d like to group meaningfully, and I know in the UI I can use folders for that.

Desmos’ API docs say that setExpression can take a type property, but claim it can only be expression (which is the default) or table – though further down it becomes evident that it can also be text.

I have succeeded in creating a folder with setExpression({ type: 'folder' }), so that apparently works as well; but I have been unable to rename the folder (name, text, title, and folderName all have no effect, it remains “Untitled folder”), and I can’t figure out how to put other expressions into it either.

Google is no help. Is this community up to the challenge?