For anyone who got here because 7+Taskbar Tweaker stopped working after the last Windows update, the above thread is correct, except you must reboot your computer after unlocking the taskbar. Then you can drag multiple windows of the same program (e.g. Chrome) within the group. So maybe you don't need Tweaker anymore.
My Computer
System One
-
- OS
- Windows 10
- Computer type
- PC/Desktop
- System Manufacturer/Model
- Dell