The visibility of the file extension is a function of Finder not of the Application or its Files. Your file will have the .pages extension (suffix) whether you want it or not. Otherwise MacOS cannot tell which app to use to open the file when you click on it. However, there is an option to make the extension invisible. Go to Finder > Preferences > Advanced and UNcheck the item labeled "Show all filename extensions".
That is normally the default, but sometimes files from other apps or sources will come in with the setting for that unique file to have the extension visible. As Alternaut suggested that has to be changed on a file by file basis through the Get Info option.
NOTE: Many apps, including Pages, have an option in the Save dialog to show or not show the extension. You might check your copy of Pages to see if that option is checked or not. As a reminder, the option is only to HIDE the extension but the extension will still be there whether you want it or not.
Last edited by joemikeb; 03/13/18 07:31 PM. Reason: add note
