How to make the background go dark but the characters stay the same?

I wanted to know if there is a way to make the background go dark or “make it dim” while the characters don’t change (if that makes sense) and if it doesn’t can someone teach me how.
Thank you

Use a filter before your characters walk in

Use the Effect Dim 60 overlay

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INT. BACKGROUND - DAY with Effect Dim 60 at layer 1
@ CHARACTER 1 stands screen center

@ CHARACTER 1 moves to layer 2

Thank you