How to find a specific component in Altium PCB
Key in 'j', 'c', and enter the designator. "(J)ump"->"(C)omponent". 

This works in the schematic editor as well.

Alternatively, open the PCB panel, and select 'Components' in the top drop-down selection.  Sort the available columns by designator, and click on the component of choice.

The zoom level and highlight mode, for the targeted component, are both configurable in preferences.