My Iphone X is locked in the "slide to power off" position, what can i do?

Follow these instructions to resolve a frozen iPhone→If your iPhone, iPad or iPod touch won't turn on or has frozen – Apple Support

The solution has already been posted on this page.

Read Lawrence's reply. It was posted just prior to your last post.

My phone 11 is frozen on the “slide to power off”. Please help

See the Apple Recommended post near the top of this page.