I found this is the page that tells you if you opted into continuing to receive printed copies of "QST".

https://home.arrl.org/action/

You have to be logged in to see the details. 

Here's mine:

My Contact Information. NOTE: If I press the "opt out" button, I loose the printed delivery of "QST".


David J Ring Jr
N1EA
P.O. Box 9
Green Harbor, MA 02041

Phone: (XXX)XXX-XXXX
Email xxxxxx@xxx.org
Edit
My Subscriptions
QST |Opt Out Expires: 12/31/2099 Delivery: Print 
Status: Active
Membership Summary
Status:Active
Paid Thru Date:12/31/2099
Member Type:Life Membership
Member Number:0006033434

.73

David N1EA