If you want to change the map area you will need to remove all of the filters you have applied.
To do this you need to:
Mouse over the filter slowly to the top right hand side.
A grey filter icon appears and if there is any conditions applied there will be a red (X).
Click on this red (X) to remove the filter and ensure that SA1, SA2, SA3, SA4 do not have a red (X).
You will then be able to view all areas to begin another area analysis