Clicking the "x" to close a map popup should work always
It is very easy to misclick when trying to close a map popup by clicking the "x" icon on mobile
1. Open any view with map on mobile
2. Click on map
3. Try clicking the "x" button on the corner of the popup
Map popups can be closed by clicking elsewhere on the map but there is an "x" icon on the popup that indicates that the popup can be closed that way also but at least on mobile it is difficult to hit the button because it's so small.