What version is your app? My understanding is that the version with the setting should be available, though you may need to change it directly from the main settings section. Android has a settings cog while in puzzles, which may also be available on iOS.
I've been thinking the same over the past few days. My husband just hit 2500 and he's a 500 rapid player. I floated up 200 points with what felt like were 700 rated puzzles. Maybe with the dismal state of the world, the puzzlers just want to give us something to be happy about?