What is the Modern client?

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The latest version of Atlas Core on the marketplace includes the following comment: "If you are using the modern client, enable it by setting "$use-modern-client" to "true" in the "theme/web/exclusion-variables.scss" file." I searched the documentation, but there's no mention of what the modern client is. Is this just a reference to Mendix 10? I tried setting it and it broke my layout, so rather than just ignoring it, I'd prefer to understand it if possible   I am referring to this https://marketplace.mendix.com/link/component/117187
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