Purple color of Heatmaps become less evident and hard to see the routes

I remembered in the past the purple color of heatmaps is very distinct and easy to recognize the riding routes which means even I just rode one time on some routes the purple line is still very thick whether I zoom in or not. Now when I see purple color of heatmap it is hard to find where I have rode. There are many routes that I just had been here one time. I strongly strava to restore the appearance characteristics of purple color of heatmap. Now I am upset because it’s hard to use purple color in heatmap to plan my riding route.