As you create your artwork for high-resolution displays, you need to generate multiple image resources. As canvas size decreases the image has fewer pixels for the representation. For example, a "Home" image at 512x512 will have detail, perhaps a front-door and windows with panes. At 32x32 this detailed image would render as a blob of pixels. Your design at this size will have less detail with a simple rectangle for the door and perhaps no windows.
In some cases a single vector design is used over a range of image sizes. For example, a "Button" might be a rather simple circle with a gradient and shadow. In this case as you change export size and DPI, the canvas resolution matching is handled automatically. Here a single design and one drawing may suffice.
As one can see from the above two examples, a user interface element design may involve multiple or a single EazyDraw drawing, but always requires multiple exported images. EazyDraw has the capability to efficiently handle both.