Resizing partitions with Big Sur
I have a 5k late-2014 iMac running Big Sur with a 5TB USB external drive with 3 partitions (Mac OS ext. journaled). I need to resize or remove one partition to give me more room on the other two. However, Disk Utility says none of the partitions can be resized. Why?
iMac 27″, macOS 11.4