Changing user on Zoom using the Facebook Portal

I am using a Facebook portal to do Zoom calls. But I can't figure out how to log out so I can log into another account.

Thanks for your help!

Newcomer

I was having the same problem but I figured it out.
1) Touch the Portal screen anywhere

2) Bottom right side will appear two icons - a lock and a wheel (flower looking).
3) Click the wheel (flower)

4) Under ‘General’ on the right side of the screen, scroll down and you’ll see ‘Sign Out’

Sign up