Are you trying to copy the iPhone notch or something? It should just be a bubble at the left with the other bubbles. It was also still there whilst in ride POV cam, I hope to goodness that's just a bug. Everything else looks awesome, so this is a really weird distraction!
Yes! Please, either move the Heatmaps button to the side or even better the bottom of the screen as in Planet Zoo. And why would some one need it while riding a coaster, looks terrible.
After playing the game, I truly wish this was the only UI issue. But unfortunately, the entire UI appears to be a beta placeholder for the devs, and the actual Planet UI hasn't been implemented yet.