回答
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Please don't put too much head on my beer.
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Please don't leave too much froth on my beer.
ビールの泡は head と言います。このほかにも froth という言い方もありますが、head の方がよく使います。
「泡を少なくにしてください」と言いたいなら
Please don't put too much head on my beer.
don't put too much head を使った言い方。
Please don't leave too much froth on my beer.
don't leave too much froth を使った言い方。
ご参考まで!