Have you tried editing your quick panel? Slide down from the top of your screen until you see the edit pencil. Tap on the edit pencil and then you will see the quick panel blocked out with the "edit" icon in the middle. Tap the edit button, and look to see if the flashlight icon got moved to the hidden icons and then add it back if it did. Also, with the new UI, the quick panel only shows four rows when not expanded, so it may be below the expansion line. If you can no longer find the icon, you can 1) create a simple routine to double tap one of your buttons (you select the button) to turn on the flashlight and then a second routine to turn off the flashlight - example below. This would require you to download Good Lock's Routines+ module; 2) add the flashlight control to your lock screen by going to the lock screen edit feature and tapping the plus sign on either lower corner of the screen and adding the flashlight control. If you put it on the right corner, you would swipe to the left to activate the flashlight on or off. If you put it on the left corner, you would swipe right; 3) put the magnifier widget on your screen and activate the flashlight from there.
