Do not be seen by humans. That's been the law of children of the underfloor.

14-year-old Arrietty and the rest of the Clock family live in peaceful anonymity as they make their own home from items "borrowed" from the house's human inhabitants. However, life changes for the Clocks when a human boy discovers Arrietty.
In The Secret World of Arrietty, consciousness is carried by another substrate — a plane of “borrower micro-society”. The story fights on E8/E9 of the E0–E14 reality ladder, compressing secrecy, survival, friendship.
Films fighting at the same level of reality, about the same things.
This Is the End (2013)E8/E9 · friendship, survival
Scouts Guide to the Zombie Apocalypse (2015)E8/E9 · friendship, survival
Drifting Home (2022)E8/E9 · friendship, survival
Encounters at the End of the World (2007)E8/E9 · friendship, survival
Rugrats Go Wild (2003)E8/E9 · friendship, survival
Flow (2024)E8 · friendship, survivalOther films that move a human interior onto the same kind of thing.
Legion (2010)consciousness carried elsewhere · celestial showdown in a desert diner
The Borrowers (1997)consciousness carried elsewhere · tiny house society
Barbie in the Pink Shoes (2013)consciousness carried elsewhere · fairy realm
Burnt Offerings (1976)consciousness carried elsewhere · sentient house
Fat Albert (2004)consciousness carried elsewhere · cartoon TV world
Jumanji: The Next Level (2019)consciousness carried elsewhere · video‑game adventureThe same preoccupations carried by a different kind of thing — grief told through the dead, an animal, a machine.
The Land Before Time IV: Journey Through the Mists (1996)consciousness in animals · friendship, survival
Tom and Jerry: The Movie (1992)consciousness in animals · friendship, survival
Finch (2021)consciousness in machines · friendship, survival
30 Days of Night (2007)consciousness in monsters · survival
AVP: Alien vs. Predator (2004)consciousness in aliens · survival
Scary Movie 4 (2006)consciousness in objects · survival