Here is a thread and possible fixes for Win10 users whose computers keep going to sleep after about 2 minutes, power options notwithstanding.

https://www.tenforums.com/performance-maintenance/17899-monitor-turns-off-after-2-minutes-inactivity-3.html#post441903

I should maybe have mentioned that the first fix was the one that worked for me.
This is a blurry bug if you asked me. It’s in the borderland between ‘feature’ and ‘annoyance’.

Merry Holidays.