Hi all.
We added the ability to toggle areas for export into Unity.
To use this, go to File > Toggle Area for Export
A red box will appear similar to your blue area box. You can use File > Toggle Area for Export again to turn it off again. You can also hide the red box if you wish in the Settings > Show Export Areas
Any area surrounded by this red box will be exported into Unity if you decide to, so if you want to export a level in a certain shape, such as an L shape, you can.