The camera invert feature allows you to flip the front-facing camera horizontally during a live broadcast. This feature mirrors the image, so inverted text appears correctly to viewers, just like in a mirror.
You can put letters in the background going live on PRISM
To use this feature, tap the “More” button in the upper-left corner and select Flip front-facing camera. By default, the left and right sides are already mirrored. If you want to change this, toggle the button to flip the screen.