Want to change title bar color and remove daily on the app title form QGC Stable 4.2

Ground Control Software QGroundControl
1

i want to change the title bar color and Remove the Daily in app name
forum

2

found the answer in

QGCCommon ---->QGCCommon.pri
and delete

else {
message(“Daily Build”)
define+=DAILY_BUILD
}

but unfortunately i cannot able to find to change the color of title bar background

Thanks in advance