How to prevent Hangouts from grabbing SMS when it is NOTthe default app?

[AC Question]

New Nexus 6P. When setting up, it asked whether to have Hangouts handle SMSs. I tried it and decided that I preferred Textra.

I changed the default SMS app to be Textra from within Hangouts and then checked that that was reflected in the system settings. However, Hangouts is still getting the texts.

How do I prevent this from continuing? I want to receive my SMS messages via Textra.

 

[sydneycooper1979]

Hello! Welcome to Android Central! Have you tried rebooting your phone after you turned sms off?