Starting with an blank drive, no partition map. Two points of confusion:
1. There are two Format... options when selecting a drive. Only after making choice does it become possible to understand, from the dialog title: Format Disk vs Format Volume.

2. Once a partition map has been created with the upper UI Format... option, I then have to go to a different region of the UI and click on a different button to add/remove partitions.


Solution: The Format... options should be renamed to Format Volume and Format Disk; preferably Format Disk would be named Partition Disk since that's more understandable terminology to differentiate from setting a volume format.

But ideally the upper UI Format option should just go away in favor of making the + symbol available to add partitions even for unformatted disks. If there's no partition map already, + would bring up a hybrid Format Disk + Format Volume UI enabling the partition scheme to be chosen, while also creating the first partition and setting its volume format, in a consolidated UI.

In any case the current terminology and completely separate locations to do a simple task like this is really disjointed; actually the original bug report was going to be that gdu is completely missing the ability to partition disks.