When I am in the Training Mode, the board is in the horizontal position using 'Classis Wood' chess set.

However, when I am in the Ranked Play, the board is in the vertical position using 'Classis Wood' chess set. How do I change this to a horizontal position just like you have in real tournaments? What setting should I use to change this?

To move the board around, hover your mouse cursor over one of the board corners -- you should see the cursor change. Hold the left mouse-button down, and then move the mouse until the board is where you'd like it to be.

To make the board larger, use Page Up; likewise, if you want it smaller, use Page Down.

Hope this helps!

And press arrow buttons on your keyboard to rotate and tilt the board.