I would like to set a pane to use the "system block" setting because I need to have a block loaded by an ajax call through the Ajax Blocks module. It is suggested to use that setting and after a lot of searching I finally found the place where it should be set (Content -> Display settings -> Style -> Change). But there is no such option as "system block". All I see is "No style", "Custom style", "List", and "Rounded corners" in the variant style and additionally "Use display default style" in the pane's style.

Am I missing something? Is there another module I need to activate?

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#1 screenshot-missing-system-block-setting.png10.44 KByan

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Here is a screenshot that shows the options.