You can resize and move individual tiles within the Tiles dashboard to customize your workspace.
In order to see the resize and movement controls, first click on the "Edit Tiles" tab at the top of the dashboard, then hover over the tile you want to edit. Click any of the circles on the border of the tile to resize it or click in the center of the tile to move it.
You can also resize and move tiles by right-clicking on a tile and selecting "Unlock Layout" from the dropdown menu.
To get out of editing, just click on the "x" to the right of the Edit bar and your changes will automatically be saved for you and everyone you have shared your Tiles dashboard.