You can click the arrow icon in the top left to toggle a side panel which contains the map layers. You aren’t able to toggle the layers on or off, but they will show you the layer colour codes. The layers are:
Regions (beige)
Local Green Spaces (sky blue)
Zoom in and out of the map using the + and – icons underneath the arrows.
You can click on individual Local Green Space areas and scroll through the data cells to find out key information, such as: