record only left side with focus rite scarlett 2i4

can somebody help me? every time i recorded in the mic logo only left side has showed the color, and in the audio screen only up side show the blue frequency. so anyone can help. cause now if i want to hear my recording in both side in my earphone, i have to copy the recording in up side and i copied in down side, that so wasted my time, please help!!

Set Audacity to record “1 channel (mono)” in the device toolbar.