This article describes how to set separate ODT per rank in DDRx Wizard.
The most common case: If you have a 1 Slot 2 Rank system, when you are in ODT Models page of DDRx Wizard, you will see for the read operation, there is no option to set ODT for each individual rank.
The ODT Behavior page provides options for different ODT models per slot, not per rank. Therefore, if you want to define ODT behavior for non-target DRAM, assign the DRAM reference designators to different slots on the DRAMs page. You can assign what is actually a rank into a slot in the DDRx wizard. These are simply different naming conventions in the DDRx wizard but also control the accessibility of the ODT behavior settings.
The picture above shows still a total of 2 ranks. Since, we organized them differently in slots the DDRx Wizard allows you to define different ODT behavior for each rank.