- On RC page or Watchlist, change ?limit=10000 in url.
- See how many results on a page with $('.mw-changeslist li' ).length - the number of results will be more than 1,000 (of course if the number of results can be that number - depending on changes that actually happen, the filter selection etc).
On Preferences page the max limits for the number of results on RC and Watchlist are 1,000.