How can I re-assign closed captioning?

I setup a dummy meeting on my desktop as the host to see how the closed captioning works by assigning myself as the closed captioner. Once I did this, it's stuck with me! I joined unlogged in as another user on my phone, and I can’t see a way to reassign the closed captioning to my second self . When I click the CC button at the bottom on the desktop, it just opens a window for me to type. When I try to click the CC icon, it displays the mute button over it. The popup menu has no closed captioning option.