If you're looking to reduce the height of your Code block, the best way to do this is using Custom CSS. Here's the code you need and how to video.
How to fix the Code block in SquareSpace when it is too tall
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Squarespace Web Design Tips
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Squarespace is a website builder for personal and professional websites. This post highlights a selection of my tips and steps to help you accomplish common website functionality and design tasks on the Squarespace platform.