Always on Display
You can get the screen on result without rooting or downloading any app. All you need to do is unlock developer options, tap on model number 7 times. Once unlocked, there will be a setting for it, Stay Awake, under Developer options. Only works while charging, though to prevent rapid battery drainage.
I only use while working to prevent tab from going to sleep. I turn screen off plus close cover of auto wake folio when not in use to prevent screen burn.