On left most part there is the status display that shows whether Anyfiddle UI has active connection to the project instance. This has to be green to save files and run commands
Anyfiddle lets users access servers running in a specific port via a public HTTPS URL. The port mapped and the url to access the server in that port can be seen in the bottom bar. Click on this will open the server endpoint
Clicking on the Run button will execute the
defaultCommand in anyfiddle.json.Most templates will have this defined based on the language and framework Read more about configuring an Anyfiddle project with anyfiddle.json in link below.