This step by step guide with images covers how to find the power button and how to use it on iPhone X, XS, XS Max, and XR.
iPhone XS/iPhone XR: how to force restart, enter recovery, and DFU
How To Turn Off and Restart iPhone X/XR/XS/XS Max
How To Reboot and Hard Reset iPhone XS, XS Max, XR, and X
iPhone XR - First 12 Things To Do!
How To Turn Off and Restart iPhone X/XR/XS/XS Max
Apple iPhone Xs / Xs Max - Power Device On or Off - AT&T
Where is the power button on iPhone X, XS, and XR? - 9to5Mac
How to quickly access Apple Pay on iPhone X, XS, or XR - 9to5Mac
The Next 'Cheap' iPhone Might Not Have a Home Button
Waiting on the 2020 iPhone 12 5G? Apple may pull off the X/XR