Hello,
Sorry to hear you are having issues. That option on Windowblinds mean for putting the start button in the middle vertically not horizontally. There is no option to move Startbutton to the middle of the taskbar horizontally in Start10 or Windowblinds. But you can use Stardock ObjectDock and use its build in StartMenu Docklet and put that Dock in the middle of the screen just above the taskbar.

There is a small warning : ObjectDock is not fully compatible with Windows 10, it might not work in your system. There is 30 day Free trial, if you wish to try it.

Basj,
Stardock Community Assistant.

thanks for sharing the information which is helpful now i can move from window 7 to window 10
by the way, our company deals in commodity

Quoting neone6,

reply 5

Skinning the Actual Graphic for the Startbutton with a BIG space in front of it then put it in skinstudio, you actually can make it so the Startbutton Appears to be in the center horizontally, however the Taskbar buttons still will only show on the right side of it - NO buttons on the Left side of the Startbutton.

That would also make the vertical taskbar start button disappear though right?