Button Grouping makes the Windows taskbar do two things:
1) keep taskbar buttons from the same application side-by-side
2) sometimes merge multiple windows from the same application into a single taskbar button

I love the first behavior and hate the second. Fortunately, the conditions for the second are changeable without affecting the first, and with HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced DWORD "TaskbarGroupSize" set to 99 (basically meaning "Don't merge until an application has at least 99 windows") I can effectively eliminate the second behavior entirely.

I would very much like it if DisplayFusion's taskbar could be made to provide the same "grouping without merging" functionality, whether via a similar "minimum windows to merge" value that I can set obscenely high, or a separate "keep taskbar buttons from the same application consecutive*" setting.

*Your phrasing may vary.

I'm using the Tool "Taskbar Shuffle" to manually (!) arrange Tasks in the Taskbar.

Try it, maybe this is what you're looking for.

I see that this post is very old, but I'm having the same problem. Did this feature ever get implemented?