How much flexibility do I have to customize how things appear. I like the function of this tool but I see a lot of opportunity in the UX and will restyle and reformat layout if possible.
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Our customization guide is the best place to get a sense of what's customizable: https://getchamp.net/guides/customizations/
In general, what you see you can customize with CSS. There are certain parts of the page you can customize with Liquid templates as well. If there's something specific, please let me know and I can give you a more specific answer.