By default, the grid of contracts is sorted by company name and then by contract name. The field on which the grid is currently sorted is highlighted in a darker blue.
You can sort the grid on a different column simply by clicking on the column header. Clicking on the same column header again then re-sorts the grid in the opposite order.
Alternatively, you can click the right mouse button over the field header, and choose either Sort ascending or Sort descending from the pop-up menu.