Hello,
You can set those pinned application to the left in Stardock's Start11.
You can set it here. Pick the "Left aligned" option. But, do know that if you set in to Center aligned. Those icons will shift to the left accordingly while you pin more and more icons on there taskbar. Once it is full you also can set the taskbar to have 2 rows or more.

Thanks
Basj,
Stardock Community Assistant.