Hello there
Does anybody know how to change the background colour from black to white on the workout screen
Can't see it anywhere in the settings
100%
You wouldn't go through a one hour workout with an always on white background. It consumes massive battery on an OLED display device. I don't think you will ever see this here.
VA4 has a Memory in Pixel display. It doesn't matter what background you choose, you won't get any less or more battery. Totally different tech.