If you find the chat window, rating, menu bars, or anything else on the screen distracting when you play chess, you may want to try focus mode!
To enable focus mode, hover your mouse on the top right of the board and click the icon under the settings gear. The focus mode icon appears only when you move your mouse into the area.
When you enable focus mode, the board will expand, showing only the board, clocks, and the draw and resign buttons.
To exit focus mode, simply click the x icon on the upper-left corner: