How do I enable letterbox for my display

EDIT:It's not Windows OS that provides the setting rather Intel Graphics that does. Apologies for the error. Though still would like to know how to change Intel Graphics settings. (Intel graphics settings on windows: )

What I want:

I have a 21" 16:9 Dell Monitor (as an external monitor for my laptop) that can support resolution upto 1920x1080. I want to use resolution 1680x1050 (aspect ratio 16:10) with letterbox on the sides. (In Windows this is an auto feature and changing stretched vs letterbox is provided in the Display settings.)

My quest to a letterbox

To have the letterbox, I have tried various codes from different forums and answers (their output is in brackets and in italic such as this):

$ xrandr --output HDMI1 --transform 1,0,-100,0,1,0,0,0,1 (moved screen to right)

$ xrandr --output HDMI1 --size 1680x1050 --fb 1680x1050 (did nothing)

$ xrandr --output HDMI1 --mode "1680x1050_60.00" --scale 1.6x1 (stretched display)

$ xrandr --output HDMI1 --set "scaling mode" "Full aspect" (error)

xrandr --prop

running the following command line to get information on my displays:

xrandr --prop

Note: HDMI1 is the external monitor.

output:

HDMI1 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 480mm x 270mm EDID: 00ffffffffffff0010acb8d054364530 101b010380301b78eac7b5a756539c27 105054a54b00714f8180a9c0d1c00101 010101010101023a801871382d40582c 4500dc0c1100001e000000ff00525946 3337373448304536540a000000fc0044 454c4c205332323138480a20000000fd 00384c1e5311000a20202020202001f4 02031ef14b90050403021101141f1213 230907078301000065030c001000023a 801871382d40582c4500dc0c1100001e 011d8018711c1620582c2500dc0c1100 009e011d007251d01e206e285500dc0c 1100001e8c0ad08a20e02d10103e9600 dc0c1100001800000000000000000000 000000000000000000000000000000c1 max bpc: 12 range: (8, 12) content type: No Data supported: No Data, Graphics, Photo, Cinema, Game aspect ratio: Automatic supported: Automatic, 4:3, 16:9 Broadcast RGB: Automatic supported: Automatic, Full, Limited 16:235 audio: auto supported: force-dvi, off, auto, on link-status: Good supported: Good, Bad non-desktop: 0 range: (0, 1) 1920x1080 60.00 + 50.00 59.94 1920x1080i 60.00 50.00 59.94 1600x900 60.00 1280x1024 75.02 60.02 1152x864 75.00 1280x720 60.00 50.00 59.94 1024x768 75.03 60.00 800x600 75.00 60.32 720x576 50.00 720x480 60.00 59.94 640x480 75.00 60.00 59.94 720x400 70.08 1680x1050_60.00 59.95* 

As you can see, my HDMI1 display does not support scaling mode . But I know that letterbox is possible for this monitor as I have done so in Windows 10.

Conclusion

The main reason why I want it unstretched is because I am using a graphic tablet. Drawing on a stretched screen would mess up what one would try to draw. I might be overlooking something abut this is just taking too damn long to figure out. Any help would be appreciated.

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