How to Change Articles in the 'Keep Reading' Section on Posts

Does anyone know how to change the articles that show up in the keep reading section under a post?

Joël C.
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This isn't possible in the old web builder and in development in the new web builder!
Dennis A.
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got it, thank you. Do you know if infinity scroll is in the works? Meaning when you finish one article it shows another article under the original.
Joël C.
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Haven't heard about that particular piece...