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Connect XPS 15 9550 with 4K UHD screen to 1920x1080 external monitor

I have a display setting of 1920 x 1080 with 125% DPI scaling on my XPS 15 9550 with 4K UHD screen. 

When I connect it to my external monitor with the same maximum resolution of 1920 x 1080 using the "second screen only" option under "Project" of Windows 10, everything seems to look smaller than typical 1920 x 1080 resolution.  When I troubleshooted, the only option I could manage was to use the "duplicate" option instead of "second screen only" option.  If anyone knows how to do it, please share with me.  Thanks!

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