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

PRP_53 wrote:

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

The APFS Container is a partition albeit a partition with special features due to the use of the APFS file system.

If there is a technical difference, it would not be something that the average user will understand or care about. For the average user thinking of the APFS Container as a special partition is fine.

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

Erase and reformat a storage device in Disk Utility on Mac

This is the OP's only option since macOS can only merge a partition onto the end of another partition. The first physical partition has no where to go or merge.

This is exactly why I don't recommend anyone to partition any of their drives, because sooner or later the user will encounter this exact situation requiring lots of time & effort to resolve. If a user is using the APFS file system, then using multiple APFS volumes within the APFS Container is the way to go since it provides the separation provided by multiple partitions, but does not require physically dividing the drive into smaller segments of a particular size since the storage pool of the APFS Container is shared among all the APFS volumes within that Container. APFS volumes can take advantage of Quotas to limit their size, but some research & experimentation may be required, plus I don't know how easy it is or if it is even possible to change the APFS file system Quota after creation.

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

Thanks

Yup, first Partition in a partitioned drive does present this type of issue

FYI and an aside

Only came across your reply when checking My Subscriptions - No Auto Notifications from Apple, again

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.