Hello and thank you for responding.
The add'l post was because no one seemed to be responding to this original one. The additional post got someone's attention.
In response to the questions:
1. To which settings/option are you trying to modify the screen lock timeout?
Control Panel\All Control Panel Items\Power Options\Edit Plan Settings AND
Advanced Power Options
Display (all set to large values)
- Turn off display after
- Console lock display off timeout
2. Do you get any error message or is the option greyed out?
No error message but the screen locks after approximately 15 seconds. I've not been able to adjust this.
3. Are you facing this issue in local account or Microsoft account?
My Microsoft Account.
NOTE: I use this account for another Windows 10 system and it does not exhibit this problem.
You may follow the below steps and check.
1. In the search option of the taskbar type "Power and sleep" without quotes and press enter.
2. Now select the desired option in the screen and sleep section.
I've done the above.
When you follow the above steps to change the screen timeout option, Does the settings get applied?
The settings appear to be applied. They hold after a reboot. But they screen lock still times out after 15 seconds or so.
I've read every post I can find on this issue. In addition to the above:
I've run the diagnostic tool for power configuration (can't remember the exact name). It reported no issues.
Reset all the power plan settings to default.
Created another user on the same system and that user does not have the same issue with the screen locking very quickly. Which is why I asked about user-specific power settings in a previous post (above).
None of this seems to have any affect.
Thanks in advance for your help.