Don't know if callout is still the correct term after the redesign. We decided to go for something like the Google Maps design. When you press a marker on the map you then get the bar information in a box at the lower part of the screen. When you click or drag the box it expands to fill the whole screen.
myrjola
commented
7 years ago 
Don't know if callout is still the correct term after the redesign. We decided to go for something like the Google Maps design. When you press a marker on the map you then get the bar information in a box at the lower part of the screen. When you click or drag the box it expands to fill the whole screen.