Move the Start button and taskbar icons to the left — via Mauro Huculak, Pureinfotech

The easy way

1. The easy way: Settings → Personalization → Taskbar → Taskbar behaviors → Taskbar alignment: Left.

Registry change

Double-click a .reg file and confirm to merge it. Right-click → Edit first if you want to read it, which is always a good idea with any .reg file from the internet.

Apply

Windows Registry Editor Version 5.00

; Oddbyte.Me: Move the Start button and taskbar icons to the left

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"TaskbarAl"=dword:00000000

Undo

Windows Registry Editor Version 5.00

; Oddbyte.Me: undo Move the Start button and taskbar icons to the left

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
"TaskbarAl"=-

Same thing from a command prompt

Run in a normal (non-admin) Command Prompt or Terminal.

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /t REG_DWORD /d 0 /f

Undo:

reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v "TaskbarAl" /f

The value name ends in a lower-case L (Taskbar-A-l, short for alignment), not a capital i. Deleting the value returns to centred icons.