At the top bar where the day number is shown, you will see the smiley/color for whatever mood you logged that day. If I don’t want to track my moods, then I’ll never see a color there. I use the color to tell me which day I’ve already logged, like as an indication that I’m done with that day. I don’t want to track mood though because it’s a lot of work just tracking symptoms and right now, my mood may or may not have to do with my symptoms and isn’t a good indicator of my symptom severity. I want to see a color on the days I’ve logged my symptoms and easily see when they were worse or better on the top day numbers.