DS-5 With multiple physical Arm chips in jtag chain

I’ve got a custom board with two physical FPGA’s, each of which have two arm processors connected to the same JTAG chain. I tell DS-5 to connect through the USB-Blaster II, and it connects! Yay!

But which FPGA does it connect to? And how do I tell it to connect to the other FPGA’s Arms? I see no relevant options in DS-5 debug config.