Lock Screen Timeout Settings on Windows PC

Not sure if I have forgotten to set something or if I have not set something right but looking at some Windows 11 devices we have, I can see via Control Panel power settings that the monitor is set to go to sleep after 25 minutes but I wonder if this only applies when left open on desktop because from lock screen, monitors are going blank after a minute or so.

It doesn't look like the devices (Intel NUCs) are going to sleep themselves because the power light is still a solid blue, mouse laser still on etc. but sometimes users cannot wake the devices up through mouse, keyboard or power button input and end up restarting from the plug.

Have not tested but will try to see if being connected to projector\SMART board makes any difference.