Search Replace SHIFT+ENTER characters in a content block

Hi everyone. I started using Siyuan Note for a few days. Can you guide me how to quickly remove the SHIFT+ENTER character in a content block (using the Replace function (Ctrl+R) for example)?
In my specific case, I converted a book from .epub to .md. Then I imported that file into my existing Notebook. But I found that most of the content blocks contain a lot of SHIFT+ENTER characters. And I want to remove those unnecessary SHIFT+ENTER characters. Can you guide me?

Thank you very much!!!

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