I got tabs with this command, but it inverted (I have he-il build). Also the timeline inverted (Also in RS4).
Computer Configuration > Administrative Templates > Windows Components > Sets Policy On the right side, and double-click the Turn off Sets setting. Select the Not Configured option. restart i can't get sets to work even tried above. Windows10 insider build 17666
I thought Microsoft were superstitious enough to skip both 13 and 666 in their build/version numbers, but things have changed at Redmond. Bad luck and the devil is apparently accepted these days.