A 2.40:1 movie on a 2.35:1 screen will have tiny letterbox bars about 8 pixels high on the top and bottom.
The upcoming Canadian-French Flash-animated science fantasy musical comedy, The Atomic Betty Movie, will be presented in 2.40:1 of its anamorphic format, and is coming in 2024 on Pure Flix.
It's the newest full-length feature presented in CinemaScope.