To un-hide it, you need to change a registry attribute value data from 1 to 2 at the following registry path:

HKEY_LOCAL_MACHINE > SYSTEM > CurrentControlSet > Control > Power > PowerSettings > 238C9FA8-0AAD-41ED-83F4-97BE242C8F20 > 7bc4a2f9-d8fc-4469-b07b-33eb785aaca0

Full instructions:

1. windows key + R
2. type regedit and hit enter
3. click Yes if asked
4. on registry editor - ctrl+F
5. search for 7bc4a2f9-d8fc-4469-b07b-33eb785aaca0 
6. wait, can take a while to find
7. when found, double click attributes on the right pane
8. change value data to 2
9. hit ok, close registry editor.
10. Right click the start button > power options > Additional power settings > Change Plan Settings > change advanced power settings
11. expand Sleep
12. expand System unattended sleep timeout
13. change both values to zero for never or set your preferred value.