Messenger and native Messaging apps both want to be default for SMS

I have android version 5.0.1 on LG Leon. I want to use Facebook's Messenger app as default for text messages. I see no way to uninstall or permanently disable the native Messaging app.

I set Messenger as default for SMS, but recently this default has not been "sticking" and Messaging keeps taking over again.

Any suggestions?
Thanks

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