Last time I checked, Windows 11 lost this capability and 3p solutions like Windhawk are needed. I'd be very happy if they brought this back though, feel free to share a link to some info about how to do it natively.

That was my impression too.

"natively" is the key word here, this looks like a 3p hack.

It was removed in Win11, when they rewrote the taskbar to pretend that it's macOS dock (icons centered by default). Today your only options are horizontal taskbar along the top or the bottom edge, and icons aligned left or center.