How to change level editor settings?

Open Resources folder and select Level Editor Settings.

You can create your level design template and add it to the editor. To do this, you need to add prefab of your design to Designs Prefabs. Don't forget to add preview image to Designs Previews.

You can remove some color or change, add your color option. To do this, you can add another material to the Designs Material list or change the color of any material from the list.

You can also change the starting positions or corners of the Environment Objects.