I looked at several different Chrome extensions that students could use to cover up or blur their backgrounds, and Background blur for Google Meet was the one I liked the best.
It’s simple, doesn’t distract, and does exactly what it says it does. Once installed, you hit the red button to start blurring your background. There is a slider to adjust the amount a blur. I like just a little bit, like what YouTube streamers get by using a DSLR camera as a web cam.