I’m running Windows 10 Home (build 19044.2006) on Asus UX481FL and the lock screen always pops up after inactivity timeout.
Screen Saver Settings > "On resume, display logon screen" is off
Sleep is "Never"
Hibernate is "Never"
System unattended sleep timeout is 999999min (for some reason it doesn't switch to "Never")
Sign-in options > "Allow Windows to automatically lock your device when you're away" is off
What else do I have to check?