Perhaps you can share with us what you trying to achieve here so we can give you some suggestion.

I was merely exploring all the settings. Just out of curiosity.

Actually this "URL Format For Entry View" setting already determine what single post entry URL format.

Ya now I get it. Entry = single post page

Keep us update if you need any further assistance.

Just for your information, I have locked and marked this thread as resolved to avoid confusions in the future. Please start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiries.

Thanks for understanding.