Customizing your personal analytics 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:
If you want your tiles to display over the entire width of the screen, select 1 column, and it will automatically expand the tiles. You can also drag the tile edges to resize them manually if there are 2 or more 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 the 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.