Diminishing light

[CtheUSA]

My S8's screens lite up for about 4 seconds and then turn black on me. How do I extend the length of time any screen is kept ON? Need a step-by-step explanation. Thank you SOO much

 

[B. Diddy]

Welcome to Android Central! Any power-saving modes turned on? Or is Smart Stay on? https://forums.androidcentral.com/e...ure-on-my-samsung-galaxy-s8%2F&token=rzsVchZB