Simulation»Camera»Center (Ctrl+Shift+Space)

The Camera Center function points the camera towards the center of the currently selected object, or if no object is selected, then towards the center of the world coordinate system (i.e., the center of the three grids).

When the current focus is on the Controller Time-Line window, the Center function will adjust the position of the time line so that the blue vertical line (marking the current time position) is visible and centered in the Time-Line window.