DVE: Hard to delete a partition

If you select graphically a partition and press the Delete button, nothing happens

The Remove button in the toolbar is also inactive

The condition to make it active is very weird

You must select it in the workspace, but not like this:

Like this, but getting to this state seems... random

I clicked 5 times on the partition to make it become selected like this

Also selecting from the graphic scene should enable the Deletion.