Earlier quoted context omitted.
This functionality was removed in Windows 11 and as far as I know has not yet returned.
I literally went through those steps in order to write that comment. The functionality is not gone.
Are you talking about aligning the icons to the left or the whole taskbar?
We're talking about moving the whole taskbar to the left (or right) of the screen similar to how Ubuntu looks for example.
You used to be able to move the taskbar to any edge of the screen but that functionality was removed in Windows 11.