How to remove info alert from Problog archive listing page

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Problog Version 2.3.2
Concrete5 Version : 5.7.4.2

I'm getting an info message on my problog archive listing page. Please see the attached file.
The message is
"The Content page type composer form element will output its contents here (Block ID 311)".

I'm not sure what Block 311 is.

How can I remove this message box. Deleting this from the page does not work.
If I edit the block, this is the message that I get:

"This block is an alias of Page Defaults. Editing it here will "disconnect" it so changes to Page Defaults will no longer affect this block."

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