Simply choose the sector and a layer, press the ‘PLUS’ button at the top, fill out the area name, choose the color, and save. Then you will set the area placement on the layout on the right side. Save your change and you're done.
Go to the Branches → Layers → Areas/POI,
select the sector and layer you want to add the area to,
click the ‘Plus’ sign,
set the title and save it,
then the new area / POI will appear in the map and you can resize and move it to the correct position.