You can choose how to display orders.

Display all orders
All orders, including deleted orders are displayed.

Don't Displayed Deleted Orders
Only display live, not deleted orders. This is useful if you want to process orders and once complete you delete them. Once deleted they aren't shown.

Only Display Deleted Orders
This can be useful if you want to archive (move) deleted orders into another site.

By default deleted orders are not displayed.

Automatically refrsh orders when an order has changed
If you want to redisplay all the orders whenever any changes have been made tick Automatically refresh orders when an order has changed. You should un-tick this option if you have a large number of orders and want a faster screen update.

Clicking on order line ticks order
To process orders you need to select (tick) all of the orders. You can do this by clicking the box on the left of the order. You can tick the Clicking on order line ticks order option to automatically tick the order when you click anywhere on the order's line.