What is the blue section at the top of this image (above Macintosh hard drive partition)? Is it another partition, it only seems to exist on this partition when I create a new one. Where do I find the EFI boot partition?

Thanks :-)
What is the blue section at the top of this image (above Macintosh hard drive partition)? Is it another partition, it only seems to exist on this partition when I create a new one. Where do I find the EFI boot partition?

Thanks :-)
The blue shaded area in the image provided is part of the Macintosh HD volume.
The blue shading denotes the used space on a volume.
The EFI boot system cannot be viewed or modified with any Apple-supplied GUI tool.