Filters are available by default on Watchlists. Have the filters on Watchlist is supposed to be controlled by the Beta preferences. I've tried to change my preferences using my WMF account and my volunteer account on WIikidata with no change. apparently, @Lea_Lacroix_WMDE tried it as well with no success.
`'wgStructuredChangeFiltersOnWatchlist'` has ` 'default' => true` on https://noc.wikimedia.org/conf/InitialiseSettings.php.txt, which means the filters would be default on all wikis.
I have that tissue on deployment train phase 0 and phase 1 wikis (mediawiki.org, all non Wikipedias, Wikidata, Catalan Wikipedia)
On phase 2 wikis (fr.wp, es.wp), I've been able to enable and disable the Betafeature.
@Petar.petkovic is investigating the configuration. That configuration change wasn't supposed to happen.