What happened to double click to drag?
New 2017 MacBook Pro. OS 10.12.8
My older MBP using 9.10 I could do a double tap with one finger to move windows, etc. Under Sierra I now have to use 3 fingers to move a window and that doesn't work when you want to move anything else like an icon on the desktop or an image in Quark.
There doesn't seem to be a way to customize selection clicking.
I've checked the MacBook Pro manual and did a search in spotlight.
MacBook Pro with Retina display, OS X Mavericks (10.9.5), 15"