I have a lens visualization (in version 7.15.0) where I want bar chart showing "Closed" vs "Not closed" where I color "Closed" with green and "Not closed" with red. To be able to set different colors for the bars I use two layers, but the thickness of the bars is halved causing the alignment of the labels to look weird.
I think you can achieve what you want with a single layer in Lens, with filtered metrics. Here I've used the extension.keyword with "css"/"deb" instead of your Closed/Not closed categories, but the same result applies.
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