Welcome to the Apple Support Communities!
I understand you are unable to enable Face ID on your iPhone X in the Settings app. Try restarting your iPhone first, then force restart to see if you are able to toggle the setting. If that does not resolve the issue, you may need to Reset Face ID.
iPhone User Guide - Restart or Force restart iPhone X
Restart iPhone. To turn off iPhone, go to Settings > General, then tap Shut Down. Or:
| iPhone X: Simultaneously press and hold the side button and either volume button until the sliders appear, then drag the top slider to power off. |
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Force restart iPhone. If iPhone isn’t responding, press and hold down the button combination for your model until the Apple logo appears:
| iPhone X: Press and release the volume up button, press and release the volume down button, then press and hold the side button. |
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Get help with Face ID on your iPhone X
Take care.

