Why can't I adjust the height of each section in the Zotero style editor?

pureimagination
Zotero 7.0.1

I want the section displaying the references much smaller but I can't adjust the height.

Thanks.
https://s3.amazonaws.com/zotero.org/images/forums/u14793917/ncjpsj0v92mzbko4xfbs.jpg
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