Hi DevaPriya,
It seems the option is not there anymore. The docs don't mention the page option: https://docs.mendix.com/refguide/app-from-spreadsheet/
Studio had the option to generate the pages and this still shows in the learningpath, next to the import data button:
Maybe they are still working on it? In the meantime you can recreate these simple pages with a data grid and the standard new/edit/delete buttons.
Hope this helps!