How to re-format a deleted volume in Mac OS High Seirra/Mojave

Question

After installing Catalina on a machine I realized some programs I want to run on this machine are still 32-bit. So I went to downgrade from Catalina to High Sierra and since there's no way to re-run the High Sierra installer once you install Catalina, knowing that I had to reformat my drive I rebooted into Disk Utilities. (in my case I happened to be booting into a High Seirra installer that is on a USB bootable stick).

Unfortunately I made the mistake of deleting my VOLUME (not just reformatting the drive), which is on the LEFT in Disk Utilities, and now I can't get it back. I don't mean "get it back" is in recover the data (there is no data to recover-- the disk was empty), I mean I can't even see the drive mount at all in the toolbar of Disk Utilities.

I now have both a High Sierra and Mojave bootable disks, and when I boot into the High Seirra disk I don't see the 500 GB internal disk "Volume" in the left of the toolbar.

how can I reformat the drive to reformat the 500 GB interal disk (this is on a Mac Mini 2014)

Answer 1

The Mojave bootable installer worked.. unlike the High Sierra bootable installer, which shows no logical drive in the toolbar in Disk Utilities, the Mojave bootable installer does, and I can use this to re-initialize the drive.

It appears to be a flaw in the High Sierra Disk Utilities when booted from USB drive

Answer 2

Close Disk Utility, Restart from Menu and you will see deleted volume, just reformat and volume is ready to use