$wgStructuredChangeFiltersShowPreference was a temporary config variable used while RCFilters was in Beta. Now that the feature has graduated and is stable, we should remove it. Please leave $wgStructuredChangeFiltersOnWatchlist in place for now, though.
Customize query in gerrit
|mediawiki/core||master||+17 -43||Enable RCFilters on installs by default, deprecate old paths|