How do I vertically align centers of objects in relation to each other?

I'm positive that I've done this with C3 in the past, but I have spent at least 20 minutes fruitlessly searching for the ability to align objects in relation to each other.

I'm selecting objects on the layout, right-clicking, and navigating the alignment options. I thought there used to be an option that would toggle between "align to layout" and "align to other objects." There are now options that allow us to distinguish between "align to layout" and "align to viewport," but I cannot find the "align to object" option.

You can only align by edges. If you need to align centers, simply set the same X coordinate for all selected objects, leaving Y empty.

As always, "Thanks, dop2000!"