How do you enable three finger swipe highlight?

[artnotwar]

My girl and I both have early 2011 MBP's.
On mine, I can highlight things if I swipe the trackpad with three fingers. Hers doesn't.
I've looked in preferences for somewhere to enable it but can't find it anywhere.
If anyone could help that would be really good. Thank you.

 

[GoCubsGo]

Three finger drag is enabled under settings/trackpad.

 

[artnotwar]

Thank you.

 

[kocoman]

In the "Sample" at the preferences, it moves the whole "Active window" around how to do that?

It only does "highlight/select"