Whats the best response to the following interview question?

I work in admin, but I want to leave because of the toxic environment. My mental health is suffering because it's gotten so bad. Obviously I can't speak negative like that at an interview.

If they ak me why I want to leave my current role, what would I say? I can't say for a change as it's the exact same role I do now.

Whats the best response to the following interview question?
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