If you'd like to change the virtual background when giving a lesson, you have some options to choose from. We don't have a built-in feature at the moment, but we present you below some alternatives:
While using Learncube and having an Apple device, you can blur your background. You can do this once in the classroom by going to the window's top right, selecting the video effects block, and then choosing "portrait" on the control centre icon.
A second option would be to change your background using an external video software like ManyCam. (Just keep in mind this app might slow down the class a bit).
As an alternative idea, some tutors have a whiteboard or a board with notes related to the topics they teach so that students can see that instead of their homes.