This is true both in mobile view and on the computer.
When you're in a non-historic layer view of the map, there is a home button on the bottom left corner of the screen. However, once you activate a historic map layer, that home button is underneath the button to toggle the historic map layer on and off.
If you go back to era: none, you can see the home button, and users can always use the back button in their browser (if they have one), so it doesn't completely interfere with function, it's just a bit odd because you can see the layer of the buttons.
This is true both in mobile view and on the computer.
When you're in a non-historic layer view of the map, there is a home button on the bottom left corner of the screen. However, once you activate a historic map layer, that home button is underneath the button to toggle the historic map layer on and off.
If you go back to era: none, you can see the home button, and users can always use the back button in their browser (if they have one), so it doesn't completely interfere with function, it's just a bit odd because you can see the layer of the buttons.