Right now, the app makes it so the last three colors you were using for the highlighter/ pen are kept. But I think it would be helpful to have it so the colours are saved based on the colors being used in that notebook. For some notebooks I use, black, red, and green ink, and for others, I like to have a color theme to them. If the app was able to just keep the colors previously used for that notebook the same rather than the colors used throughout the whole app.