How to remove the author without removing the side section?

Dear Sir:
I want to know how to remove the author in the following link:
https://gzenglish.ga/courses-list/
I try and try . but I could only delete the author without retaining the side section that shows category, like the following link
https://gzenglish.eu.org/courses-list/

so , the question is how to delete the author while retaining the side section?

many thanks

 

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