As Space is set to 16:9, you might want to change the Game Aspect in Unity for when you are modelling regions and other items.
To change the aspect of the Game window, first click on the Game button.
Underneath the Game button, there is a drop-down menu which will read Free Aspect. Click on this, and change it to 16:9.
When you click on the Play button at the top of the Game window, it will be shown in this aspect.
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