How do I change screen orientation on iPhone X?

Access the Control Center by touching the bottom of any screen then dragging upward. For the iPhone X, XS/XS Max and XR swipe downward from the upper-right corner of the Home or Lockscreen to access Control Center. Tap the Portrait Orientation icon to lock or unlock screen portrait orientation.

Tap the Portrait Orientation icon to lock or unlock screen portrait orientation.

BerlinerX Said:

”How do I change screen orientation on iPhone X?”

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Switching Orientation:

Use the Answer to this post: iPhone not switching from vertical to horizontal - Apple Community

If you mean landscape home screen, then you can't because iPhone X doesn't provide this feature.