Manual:$wgAllowCategorizedRecentChanges

Recent changes, new pages, watchlist and history: $wgAllowCategorizedRecentChanges
Allow to filter the recentchanges by a category or one of its sub(subsubsub...)categories
Introduced in version:1.6.0 (r12546)
Removed in version:1.31.0 (Gerrit change 343426; git #9acd5508)
Allowed values:(boolean)
Default value:false

Details

Enable filtering of categories in Recent changes.

The categorization of edited pages is only tracked after this setting is set to true. It won't work right after switching.