I asked this question on the Microsoft Community Forum last April (https://answers.microsoft.com/en-us/windows/forum/all/how-to-set-how-long-until-screen-locks/1a1ce9ab-4739-48f4-8292-c4de376a7cf7). The topic has been closed so I can't reply to it.
The replies were appreciated and let me set timeout for my displays, but I have been unable to get it to consistently require a login after a set time has lapsed.
One problem seems to be that I don't see the "Console lock display off timeout" in Power Options in Control Panel. All I see is time settings for "Turn off the display" and "Put the computer to sleep". Nothing about requiring login.
Another odd thing I notice is there seem to be multiple places to choose both screen timeout and require login. Makes me wonder if I'm missing a setting somewhere and if they are they overriding one another?
Choosing to put the computer to sleep does not seem to be a workaround, because after setting that it still doesn't require a login after the set time. Actually it doesn't even seem to put the computer to sleep after the set time.
In Settings > Signin options, under Require login, "When the computer wakes from sleep" is set (and has been since last April).
Windows 10 Pro. v 10.0.19042. Same problem on two different computers with the same OS and version.
This used to be a simple task involving the screensaver settings. Now I'm finding it virtually impossible. When I forget to lock one of these computers, a day later it's still accessible to anyone by just moving the mouse.
A related question: is Windows10 really so complex that Microsoft can't provide instructions to consistently perform a simple task like this that everyone concerned about privacy needs? This seems to happen always with W10 settings - the instructions don't quite match what appears on the computer.
(BTW, I was referred to this forum by Microsoft Community Forum. I have no idea how to enter "tags" and no guidance is provided on how but it seems to be required here. The only guidance is, "Select the correct tags". Select from what? I ended up choosing one randomly because nothing that came up when I typed "Windows" seemed to apply.)