As you can see on screenshots, the layer button is visible during drone hacking, drone view and remote charging
Duplicate of this one
The portal layer history (PLH) button is located over the button for mission validation.
It's clunky that the location is shared.
Also the PLH button should be moved or hidded from the main screen of the game. The settings tab is a good option to activate the PHL button.
Confirming it's reproducible at Xiaomi Pocophone F1 Android 10
Additional to this, the directional arrow and the layer icon should both move down, so that they can be seen and accessed while mission details are visible. It's not just a "When answering questions" issue, but also when you view the mission notes.