When I go to Profile and then select a city, it brings up the map view with the left-hand sidebar of incomplete/complete streets. Whilst in that view, only the bottom 3 icons for the map are visible. This is the case for the icons in both the left and right corners of the map.
This happens only when on a tablet device, not on laptop.
On my ipad it’s the same but it can swipe upwards to see all icons, a bit difficult to explain, but I touch the menu bar in the browser (safari) and swipe it upwards.
I’ve had the same experience as Hans. I only discovered it by accident, and the first few times it felt like sheer luck, but now I can uncover those hidden icons at will. 