To enable it, go to settings, screen time, screen distance, and turn it on.

要启用它，请进入设置，屏幕时间，屏幕距离，然后打开它。

You can enable screen distance which warns you if your phone is too close, it won't let you use the phone until you've backed it up to the right distance.

你可以启用屏幕距离，如果你的手机离得太近，它会警告你，除非你把手机备份到合适的距离，否则它不会让你使用手机。