Canon EOS Rebel t3i Webcam can't adjust settings?

[Michaelsims02]

I am using a Canon EOS Rebel t3i with the drivers so I can use it as a webcam. I found on zoom and some apps the background is clearer than my face. There is no options on how to adjust any settings? Any adjustments on the camera itself don't seem to have an effect on the webcam picture on the screen. The webcam also doesn't work on movie mode. I wanted to adjust exposure. Focus for maybe a slight background blur? The image also has letter boxing on the sides. Idk how to change the resolution. Is there a software to adjust all this? Thanks

[Waddizzle]

I do not any adjustments to the resolution are available.  The focus and exposure are entirely under your control.  

Some cameras have the 3:2 output, while newer models have the 16:9 output.