Just got a new Samsung S8 but the phone seems to ignore the screen timeout setting (or other possibly relevant screen settings we could find). If not interacting physically with the screen in dims within a few second and goes to sleep at 5 seconds.
Running Android 8, Feb 2018 patch level. Restart or any other setting changes that we could find makes no difference. I did find a single reference saying to hard reset and manually install all the apps instead of the migration method from prior device fixed the problem. There are other posts of this same issue so I am hoping to find someone who had a concrete solution. Another post said to remove chrome updates, restart and update again others talking about the FB app. Looking for options without having to wipe it. We just got the phone 2 weeks ago and working through each suggestion I can find online.