Makes sense. Really hadn’t thought of it that way, though I did explore Windows audio outputs for a possible fix without a solution.
Thing is, I have an old Focusrite Saffire Pro 10 (8 in & out). Its driver allows the 4 different L/R combos to be selected right from the Windows audio device setup (all show up as system devices & any can be selected as default outs). Expected something similar with the UR; but only a single option appears for the UR with no reference to different outputs. Bit of a surprising shortcoming.
Thanks for your comment!