LG 24QP500 Owner's Manual page 16

Input
Settings > Input
Input List
aspect Ratio
16
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selects the input mode.
adjusts the aspect ratio of the screen.
full Wide Displays the video in widescreen, regardless of the video signal input.
original Displays video according to the aspect ratio of the video signal input.
Just Scan The aspect ratio is not adjusted from the original.
NoTE
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The display may look the same for Full wide , Original, and Just scan options at the recommended resolution (2560 x 1440).
There is no Just Scan menu on freeSync Mode. ( Go to Picture → Game adjust → freeSync, to set from on to off)
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Description