Failed Bootcamp installation creates APFS containers - CAN'T DELETE?!
After several bootcamp installation attempts that failed, I have finally given up.
I then checked Disk Utility and found out that each failed attempt left an APFS container. I have tried to Erase then Delete the APFS container, but it will not be consumed/merged with the main volume (Macintosh HD).
MacBook Pro 15", macOS 10.14