i don't have a dinc 4g, but if it's not in the mobile networks settings, then most likely, you can use the "lte onoff" app or the "phone info" app and switch to "cdma auto prl".
I use the 4G Toggle app (downloaded from Play). It let's you set the network type, so if you want CDMA only, or LTE only, or any other combination, you can set it there.