Resolution does not match my 49" monitor

[BlinkOk]

When I use the Smart connect my screen appears compressed in the center of my monitor. It doesn't occupy my entire monitor.

[realaud]

You can manually change the resolution.  It is also possible that your computer's graphic board does not support the top resolution that the monitor does.

[BlinkOk]

When I plug my monitor directly into my graphics card via HDMI cable the screen occupies the entire monitor

[realaud]

Why not use the HDMI connection, then?

[BlinkOk]

I was trying to reduce the mess of cables around my computer but I guess,if it doesn't work, then I will use the HDMI.