How do I enable LTE only?

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Pixel 5 should work on a 4G network as well. Where did you read that you must be on a 5G network for Pixel 5 to work? The Google site for the Pixel 5 says 5G is required .

Restart your phone. Once restarted, go to Setting –> More –> Mobile Network –> Preferred network mode , you will see LTE only option.

To activate LTE 4G on a Samsung phone, go to the Settings menu, then tap on the Connections selection. Scroll down to Mobile Networks, tap on it and then tap on the Network Mode . You should see LTE network selections and just pick the one that is best suited for your wireless network.