It’s called “suspension of disbelief” and is fundamental for most fictions. You’re able to intentionally (intentional doesn’t mean you have to concentrate to do it) lock out of your thought process anything that would be surreal in real life but fits in the movie you’re watching.
Let’s say, in Harry Potter it’s ok to kill a person with a couple words, once you willingly acknowledge this your brain can empathize with characters’ fear and suffering. If suddenly Harry shakes the wand and summons a looney toons – style anvil or an alien, your immersion breaks, for example.
Edit: it’s more like accepting a set of rules for the duration of that movie to understand and enjoy it better.
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