The Metric Section below the lead details displays field values like Lead Score, Lead Quality and so on. You can customize this area to show field values of your choice. Note: The Metric Section allows only numerical lead fields.
The Lead Properties section allows you to view and edit the the lead properties like Lead Owner, Lead Source and so on. This area is customizable and can be replaced with the Lead Fields of your choice.
This is explained in the latter section of this article.