Board Thread:Support Requests - Getting Technical/@comment-7264949-20200809011629/@comment-37336800-20200809012313

Basically, wikis created after March 11th are running on a new platform and are different than previously existing wikis. Eventually, all wikis will be migrated to the new platform.

WikiActivity has been removed in favor of using the upgraded Special:RecentChanges, and the three editors (Source, Classic, and Visual) on the legacy platform have been removed in favor of the actively updated VisualEditor (with a source mode)