Customising your personal BI Dashboard is quite easy. Firstly, ensure your Dashboard is named according to your preference. You can do this by clicking on the "gear" on your dashboard tab:
You will notice another option there for "Change Layout". You can use this to customise the number of visible columns:
You can also rearrange your dashboard by simply dragging and dropping your tiles to various locations. Simply hover over a tile, until the "drag" icon appears:
Now, hold in your left mouse button and drag the tile to your desired location. The "Grey line" at tthe top of the tile indicates where it will be positioned:
Using this simple drag and drop method, you can customize the look and feel of your dashboard.