I have spent over an hour failing to come up with the command that will move the molecule (and its center of rotation) to the center of the viewport.

I see that "cofr all" places the center of rotation in the center of mass of what is loaded. But I have been unable to find the command to move it to the center of the viewport.

I realize that I can drag it to approximate center of viewport with right-drag, but I'd like a command to do this.

For example, load anything, drag it off center, then what is the command to move it back?

Thanks, -Eric