The Level Editor workspace is where everything comes together to build levels.
On the top, you have a toolbar containing the available tools to draw, erase and manipulate boards.
To the left, you have the level selector drop down. You can create new levels, boards and other objects by pressing the + button.
The list of objects on the level, for example boards and quads are on the left. You can reorder them using drag and drop. You can toggle the visibility of an object by clicking on the eye button. Double clicking on an object, opens the properties dialog for that object.
On the bottom left corner, you have the assets browser. You can search and filter assets, pick an asset and draw it on a board.
On the very bottom left corner there is a zoom slider, and next to it on the right, you have the zoom in/out buttons, as well as the Render Options button that gives you a variety of toggle buttons to toggle rendering of different concepts.