Rotation not working

According to Apple:

Many apps give you a different view when you rotate iPhone.

Lock or unlock the screen orientation

You can lock the screen orientation so that it doesn’t change when you rotate iPhone.

Open Control Center, then tap the rotation lock button.

Need more help?

• Chat now or call 1-800-APLCARE.
• International Support.

Click ▶︎ iPhone User Guide. 📖

Good luck! 👋🏼😉

Fumuki ~ Apple's iPhone User Guide says: "If your iPhone isn’t working as expected, you can try restarting it by turning it off, then turning it back on. If turning it off and on doesn’t fix the issue, try forcing it to restart.":

Turn iPhone on or off - Apple Support

...If that doesn't help, a weak, aging battery can cause a variety of issues, so...

Does your iPhone XR still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Fumuki wrote:

Rotation is not working on my iPhone XR. I can't rotate all my applications, and I can't focus while playing. Please help me.

Not all application can be rotated to landscape mode.