How can I delete a Container Disk that is not the last Container Disk using Disk Utility?

Try the suggestion from @ K Shaffer - first

If successful - great

If Not, as this is an External SSD Drive.

I stand to be corrected but the First Partition which not the same as a Container

Copy all the Important Data Off the Second Partition to a safe location

Erase and reformat a storage device in Disk Utility on Mac

Suggest reading this from Apple regarding Containers versus Partitions

Partition a physical disk in Disk Utility on Mac

keriah (Author)

Perhaps in the MacBook Air screen that shows these disk/containers

..IF there is a Revert button, that may remove this newer partition and

return that to an original configuration; with 100% inside one container.

Another option would be if you have an external Time Machine backup

of Mac, use that (given info to restore a System) after erasure. Try & see

if there is a Revert button, in the MacBook Air screen, first. ~ IF the image

you show, is a screenshot of your Mac, then it may work. Or use Backups.

Be ready to restore from backups, if possible; include any clones you made.

If you cannot 'revert' within the screen as shown, you

may not use Recovery -- unless it's live from Internet.