Hi Eren.
I don't believe that display feature is configurable like you want it.
You can't change other values in the display either. I really want to see the current dew point, especially in hot weather. Unfortunately the display switches to a "heat index" with any temperature about 80 degrees.
However you CAN see the high/low temperature for today and yesterday, by touching the bottom left most symbol on the screen. YOU can then check today's or yesterday's high/low.