Next, type ‘regedit’ inside the text box press Ctrl + Shift + Enter to open up the Registry Editor with admin access. How to Show the Taskbar Across Multiple Devices via Registry Editor Note: If you want to customize this behavior further, use the When using multiple displays, show my taskbar on the drop-down menu to make the taskbar appear only where a window is open. At this point, you can safely close the Settings window.
The change is instant, so you should notice the taskbar appearing immediately after you check the box.
