Win7 Taskbar Tweaker
Taskbar Tweaker works also on Windows 10. It is free and it will let you tweak the taskbar.
Features: Show standard menu on right click instead of jump list. – Close or focus a window on middle click instead of running a new instance. – Disable grouping of windows by file path or application id.
Cycle through windows of a grouped button on left click instead of showing thumbnail preview. – “Open with” while dropping a file on a taskbar button instead of pinning. – Disable thumbnail previews.
7 Taskbar Tweaker needs to start with Windows to apply its custom settings.