Hi, let me help you.
Since you're on an HP Omnibook, this is almost certainly HP Command Center's "Focus Mode".
Here's how to turn it off: open the Start menu and search for HP Command Center (sometimes shown as "MyHP" or "HP System Event Utility" depending on your model). Open it and look for a toggle called Focus Mode or Focus — it's usually on the main dashboard or under a "System Control"/"Customization" section. Just switch it off, and the dimming should stop immediately; no restart needed.
If you don't see HP Command Center installed, search Start for "MyHP" instead — some Omnibook units ship with that app name instead, and the setting lives in the same place