A technician has a map of cell phone towers and needs to locate an additional tower with x,y coordinates. What should the technician do?

The technician should open the Locate pane in ArcGIS Pro and search for the coordinates because this tool is specifically designed for finding locations based on x,y coordinates input by the user. The Locate pane allows for precise searches and navigation within the map interface when coordinates are provided, making it an efficient method to identify an exact point in the geographic space represented by the map.

In contrast, using the search field on the Portal tab in the Project pane may not provide direct functionality for locating specific coordinate values; instead, it's more suited for searching for content within the portal. Enabling the Address Inspector on ArcMap's Geocoding Toolbar also does not directly offer functionality for locating numeric coordinate pairs, as it primarily handles textual addresses and not raw coordinate data. Furthermore, right-clicking the map and selecting "What's Here" provides information about a specific point that has been clicked, rather than allowing the technician to input and locate an arbitrary set of coordinates.

Thus, the Locate pane is the most appropriate tool for the task at hand, as it accepts coordinate input and offers a direct way to find the desired location on the map.