conversation in game

Hello, i'm new to this site and just need a bit of help.

When i play a game i have a box that allows me t chat with my oppnonent. When I maximise the game the box disappears. Probably doing something daft please help

Thanks

When you maximise the chessboard in the game window..that time chat box is dissappeard..and you can play the game with a big chessboard and big pices..if you want chat box again then minimise the screen..