1. Enable Hidden Power Settings 
Windows often hides advanced timeout settings like "Console lock display off timeout" or "System unattended sleep timeout." You must unhide them in the registry first. 
  1. Press Win + R, type regedit, and press Enter.
  2. To unhide Screen Off settings: Navigate to:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\8EC4B3A5-6868-48c2-BE75-4F3044BE88A7.
  3. To unhide Sleep settings: Navigate to:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0.
  4. In both locations, double-click the Attributes DWORD and change its value from 1 to 2.