Does the racket have a built-in code folding function?or I have to us addons like this? https://github.com/adhameer/drracket-collapse-atomic

sorry,s/racket/Drracket

I’m not sure - check the keybindings

Does Drracket have a function similar to visual studio that can open another text box on the editor? I mean ,like this ,so I can look the definition quickly

Split

thanks