１. There are three different areas where you can set up a virtual background and choose where you want to proceed with the operation.
１-１. After clicking on the profile icon and selecting Account Settings, click on Virtual Background
１-１. Click on Change Background
１-１. Click on your video thumbnail and select Video > Change Virtual Background.
２. After selecting the virtual background you want to use, click the X in the upper right corner.
３. Virtual background changes are complete.