FIX – Go to Smart Assist > Zero Touch Lock – Set to off:
Solution to screen lock problem
Numerous threads in regards to the issue of screen lock and not being able to disable it.I too had this issue and I change registry values and every conceivable setting and still Windows 11 would put me in screen lock and I had to re-enter my pin.
The problem is not in Windows 11 but rather something called “proximity sensor” which all hardware vendors now enable by default (HP, Lenovo, etc). In Lenovo you need to go into Lenovo Vantage and then into Smart Assist and disable “Zero Touch Lock”. Your screen will not get locked every 1-3 minutes when you step away.