The default light green color is very hard to see. I'm talking about the arrow that appears when you miss a move during training. It's also the arrow the shows the correct move in photo reading. I've looked all over for a way to change this color and can't find it.

The color of the arrows can be changed on the ribbon page "Visuals & Sound". Change the "Standard" arrow color. Please also check the manual section 4.2.4 "Adjusting chessboard orientation & colors"

Thanks,
Stefan

Unfortunately this only changes the arrow's color in the repertoire view. During training, the arrows is still a very light green that is hard to see.

Changed the color to red, looks good in rep view
i.imgur.com/tiLdzAX.png

But in training, arrows/circles are still green
i.imgur.com/QwpMbFm.png

I have good news for you. Next version will let you define the color and width of the circle and arrow shown as hints during the training session.