Attached monitor not displaying duplicate in full screen

I have attached an LCD monitor to my laptop. But when the display is duplicated the monitor does not show in full screen. Instead it shows the same in a reduced screen. I cannot find any setting which would enable full screen. Please help.
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Saqib Husain, SyedEngineerAsked:
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rindiConnect With a Mentor Commented:
What is the laptop's display max resolution? What is the max resolution of the external display?

When duplicating displays, you'll always get the lower resolutions of the two. So if your laptop's display has a max resolution of 1280x800, you'll also get that resolution on the external display even if it would support 1920x1080 for example.
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bbaoIT ConsultantCommented:
press Windows + P key and choose to extend the desktop to the external monitor instead of duplicating laptop screen. the resolution on the external monitor will be automatically adjusted according to its optimised setting.
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Saqib Husain, SyedEngineerAuthor Commented:
Why do you want me to extend the desktop? My problem is in duplicate mode.
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bbaoIT ConsultantCommented:
this is to test if your monitor can switch to its optimal resolution and what the size is.

if the monitor works well in extended mode, then it means your laptop's resolution is not adjustable for the monitor, you have to let your laptop to fit with the monitor instead of vide versa.

to do this, press the screen switch key (FN + F?) on your laptop's keyboard to turn off laptop's screen and use external monitor only. this will make sure the external monitor work in its best resolution.
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Saqib Husain, SyedEngineerAuthor Commented:
I know that too. I am sure there is nothing wrong with the laptop as it works well on another monitor.
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bbaoConnect With a Mentor IT ConsultantCommented:
> it means your laptop's resolution is not adjustable for the monitor

in other words, the monitor can't fit your laptop's resolution in an optimal way (full screen).

I don't mean anything wrong with your laptop. actually noting wrong with the monitor as well, as it might be by design like this. you need to check the monitor's spec to confirm this.

as mentioned above, if the monitor can't match the laptop's resolution, you have to let the laptop to match the monitor: turn off the laptop screen.
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