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How to active sale page like in demo

 It's quite complicated, hope you don't mind

First you need to create a catalog name it "sale"

Then please assign products to that cate and config them following this document:

https://www.magesolution.com/themes/claue/docs/m2/index.html#config-sale

And when the product is not "sale" anymore, you need to remove it from "sale" cate manually.