To Turn on flashlight on Andriod 10 Phones Swipe down from above to pull down and in the settings you will see a flashlight icon and when you press that icon the flashlight will turn on, on your phone.
Here is a visual Representation of the method.
Step 1: Turn on the Phone
Step 2: Swipe down from above to pull down you will see a menu like this.
Step 3: Tap the flashlight icon to turn on the light on the phone.
This concludes the tutorial. If you have any questions feel free to ask.
Here is a video on how to do it.