I recently picked up a 2015 iMac that was running Monterey. The person from whom I got it said he had issues, and could not do Time Machine backups because of an error... something about multiple partitions named Macintosh HD - Data... so I want to completely wipe the drive, format the drive and start over...
I booted into recovery mode (CMD-OPTION-R) and then into Disk Utility... and this is what I see... it looks backwards to me, but want to just blow it all away and start from scratch... how do I do that?

I booted into recovery mode (CMD-OPTION-R) and then into Disk Utility... and this is what I see... it looks backwards to me, but want to just blow it all away and start from scratch... how do I do that?
