There are 5 different Map styles: Box map (default), Direction Map, Line Map, Gradient Map and Organic. 

To change to an organic style map, tap on the slider menu then choose "View as Organic Map"

Your map will now be changed to an Organic Map. 

To change the style of a Box Map, go to the colorful icon in the top right-hand corner of the screen.

       2. From the drop-down, tap 'Styles'.

       3.  You will see the 5 map styles in the drop-down. scroll down to view them all. Tap 'Select' to choose one of them.

       4.  Once selected, your map will instantly change to reflect the new style you have chosen.

Box Map:

Direction Map:

Line Map:

Gradient Map: