By setting it to "Screen Timeout Options = never" you achieve kind of similar result.
Display tools is just an app like anything else and by setting "screen timeout" to never, you're saying "keep this application active indefinitely". It's supposed to be used along side continuum to reduce battery drain
The feature is actually there to be an extra level of security by locking the phone within continuum, to the degree /amount you want.
edit: for clarity I actually just wrote continuum always stays on which isn't true - i've used continuum mostly to play movies on mine which I why I get non existent timeouts.
You have basically said you do not want this safety feature and turned it off. That option has a padlock icon indicating it's pretty much there to lock your phone...
This is what I was thinking at first. But if you set it to any other value (like 3 hours for instance) it does the same.
It works and will lock your phone after the designed time. Just tested with 5 minutes undocked /no continuum.
Does the hp display tools mess with the lock screen password required timer in lock screen/sign in settings? It could be changing that to never.
Not sure about "mess" as applications are allowed to prevent screen timeouts i.e. video players, otherwise that 3 hour movie on a 10 second lock screen would be extremely annoying.
It would, however, upon request most definitely set it to never.
Importantly, it's not related to the system (global) timeout settings as running HP display tools then loading another application results in normal timeout settings.
It is on an application basis, in this case, HP display tool is allowed to stay active indefinitely just like a video player while in focus.
and the fact of the matter, setting an app to stay always on should result in this. Just because the screen is all black and act like glance doesn't mean its an internal system extension to the lockscreen