The order grid is part of the ops screen. It shows a list of orders.
The orders in the order grid are automatically sorted so the orders that require attention first are on top. So orders are sorted by arrival time, until they are arrived, after which the departure time is used.
The way the order grid looks can be configured in many ways via the settings in Administration:
The columns displayed: Default.PlanboardOrderGrid.
The date/time format of arrival and departuretimes: PlanboardDateTimeFormatString.
The maximum number of lines shown: MaxRowsInGrid