Once you have drawn your Regions you will want to review them, perhaps amend or delete one or two. Here's how.
The drop-down arrow next to Regions on Navigation panel will give you a list of all of the Regions you have drawn, grouped by category.
Click on a region name will recentre the map to that region. The selected region will also flash to notify you exactly where it is (helpful if you have lots of overlapping Regions)..
The settings icon to the right of the Region name brings up the Region editing panel on the right side of the screen. To remove it, click the settings icon again.
The Region editing panel allows you to rename the selected Region and/or re-assign it a different type (category).
Always remember to save your new Region details. Or if you want to remove the Region entirely you can delete it here.