Board help required.

Messing about with keys I have enlarged my board so it is to big for my screen. I have tried clicking " default" in settings but it will not go back to normal size. Advice please.

There are a few things you can do;

If you're using a mouse with a roller wheel in the centre, hold down the ctrl key and roll the mouse wheel back very slowly. To undo this, use the ctrl key and roll the wheel forward.

Or

You can also try using the keyboard keys ctrl and + to enlarge, and ctrl -  to decrease the size.

Or

 Ctrl and zero keys on your keyboard to reset the page

Thanks for the help folks. Got there by using Kohais first suggestion. Guess I can get on and lose a few more games now