Auto-Brightness toggle disappeared

Hello everyone, I'm new user here and I have a problem with my iphone 6 plus with ios 11.2. The problem is auto-brightness toggle at a new place ( setting > general > accessibility > display accommodations) disappeared

Now, I'm try to solved this problem by

1. Hard reset

2. Restore iphone with itune

But, both of approachs did not work !!, auto-brightness toggle still not appeared. What should I do ?.

Thank you for every suggestion