Sprint / KOM Map Markers on Companion App

Although I’ve now been riding Zwift for a while now, I’m still at a loss where the start and finish of some of the sprints and KOMs are. This is especially true if doing a large group ride and you are unable to see the line on the road or the box on the side to indicate the start.

I always wondered why we can have those markers on the companion app map so we know what is coming up?