You can easily remove the background of your image in a variety of ways
From the Image View Screen; click the 'Isolate' button from the edit tab of the right hand side info bar
When removing the background, you can choose a transparent background or select any color you want for high contrast backgrounds
After Making your selection, simply click the Remove Background button
You can easily access this function at any time from the Left side Navigation Bar
You can easily remove the background from a Reference Image directly from the Web App's Image Generation (Inference) screen.