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openSuSE Customized Partitioning
This is the control-freak path, actually several steps from the previous screen shot.
First I un-checked the box for a separate home partition, then I clicked Edit Partition Setup to get into the Expert Partitioner.
I then deleted the root partition from the suggested layout, and put root on the 64GB partition I had created with gparted earlier.
The installer had already found and used the swap partition I had created, and the EFI Boot partition, so there was nothing else to do for those.
Of course it is unusual to leave a huge unallocated area on the disk, but I will be installing other Linux distributions to this system, so I am leaving the space for that.