Since the last MediaWiki major update some “tabs” above the editing text fields were “gone”. I was asked by Pierre-Yves if these can be restored. Actually I had no clue and by accident I found out that our friends at WikiApiary do have them activated by default. So it is indeed possible. The hint on their mailing list didn’t helped very much except getting the LocalSettings.config (the config file of MediaWiki storing all custom options). At the end I was playing in the user preferences in the wiki itself and found out that it can be turned on in the user preferences under Editing: “Enable side-by-side preview“.
And the result looks like that: (the red border displays the reappearance of the tabs)
Hopefully I can improve your wiki experience. 😉