You can increase/decrease the font size in the chat window when there are closed captions. From the CC icon, CC > Subtitle Settings > Accessibility > Chat Display Size. If there aren't closed captions, go to your video settings (use the caret next to the video camera icon) and then Accessibility. When I started a Zoom meeting, I was able to use the Control +/- as a host. I wasn't able to do so as a co-host or participant. I am using a PC desktop with W10. -- Alan Katsura Moderator HLAA Tech Group