[Elecraft] PX3 Display During Transmit

[AL7CR]

On my P3 connected to my K3S when I transmit the display is frozen and shows the last spectrum.

I just noticed that on my PX3 connected to my KX3 that during transmit the current filter display covers the spectrum with a solid color.  

This does not matter much but I prefer how the P3 operates.  I did not see anything about this in the manual.  Is there a way to get it to operate like the P3 and is this normal?