The image shows the Functions tab when the functions.json file under the global Resources folder is selected in the App UIs pane. The Functions editor shows a calculator file, with the add and multiply functions nested within the file. Next to the file name is a Go to File link as well as an Add Function option. The file is selected to show its metadata in the Properties pane. Metadata fields include Path (read-only), ID, Label, Description, and Access for Application Extensions (Disabled by default). There's also a + File button at the top of the editor.