Why 綺麗なだけ?

I stumbled upon this in one exercise:

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Why do you have to use な before だけ?

ありがとうございます!

Welcome to the community!
From the lesson


I’m sure someone else can give you an actual explanation. But when な words are used as adjectives they just need it.
綺麗 is such a case

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Thank you for the quick answer! I guess that for some reason I was seeing that だ as a “to be” of sorts with a け added to it. Not the case!

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