I was trying to check out google regarding iPhone problems for reals. Safari would not rotate. Apple Support was of no help. I found the above video before resetting the system settings (ends at 1:51 seconds) to be very helpful.
If you find yourself in this situation, follow along as long as it takes. I did not know how to find the control center, I did not know the screen was set to Zoom, nor did I know I needed to restart the iPhone for the new settings to work. Just a day in life.