Chat Screen-Half Size

Is there a way to fix the screen when the chat screen showing the conversation will only show 5-6 lines of chat? I've had several chatters ask how to fix it and not sure if there is a permanent fix or not. I usually increase the zoom to 120% but of course that enlarges everything, it does show more lines of chat so that is a plus. Just wondering what other fix there might be.

Thanks!

could you give me a screenshot of the issue?

All I was told to do was click into the screen and press the control and plus keys.
This was for my laptop that had a shrunken chat screen.
My thanks to Len for the help.

I can't get the screenshot to paste into the reply box and the file won't attach. Any suggestions?

you can post it to https://imgur.com/ and give us a link