The answer may depend on your browser.
For instance if you run fgl_zoom on Chrome, you should find that if you select Copy All Rows, or Copy Selected Rows, that the appropriate data will be placed in the clipboard (via the cbSet front-call) and you can paste that into Excel etc. However if you try the same on Safari, it will popup a window that displays the selected rows in an editable TextEdit and you have to select the appropriate data, press Ctrl-C, and then you can paste this into Excel.
Browsers have historically prevented automatic interaction with the clipboard for security reasons. You'll find plenty of Stack Overflow questions on the topic such as
https://stackoverflow.com/questions/400212/how-do-i-copy-to-the-clipboard-in-javascript. That attitude has softened in recent year, hence new Web Apis such as
https://developer.mozilla.org/en-US/docs/Web/API/Clipboard/writeText. You'll note as of time and writing that API not available in Safari. We have a task to see if we can use this API
https://4js.com/support/issue/?id=GBC-2598 but as that is not available in Safari it would not be an improvement on what we have got.
Also your question might be interpreted a different way. If you were looking for the right-click options when you click on a DISPLAY ARRRAY in GBC, it might be that you want to display the Context Menu rather than the Browser menu when you right-click. In which case following
http://4js.com/online_documentation/fjs-gbc-manual-html/howdoi/customize-theme-vars/genero-context-menu.html will make Copy cell and Copy row actions available.
Reuben