Which feature appears during placement to control placement details of an object in Revit?

The feature that appears during placement to control placement details of an object in Revit is the Options bar. When you start placing elements in Revit, the Options bar becomes available at the top of the interface, providing a range of controls that allow you to specify and modify settings related to the item being placed. This includes options such as switching between different types or categories of objects, adjusting parameters, and configuring specific placement settings that apply to the current action.

The Options bar is context-sensitive, meaning it will display different settings based on the tool currently selected. This immediate feedback during placement helps streamline the design process by enabling users to make adjustments in real time rather than having to select and change properties after placement.

The Properties panel, while it offers comprehensive control over element properties, does not specifically appear during the initial placement of an object; you would typically access it after placing an object to change its attributes. The Quick access toolbar contains frequently used commands but does not directly relate to placement control. The Datum panel is focused on tools related to levels and grids, which are not specifically associated with placing individual objects.