Use third-party software. For using hi-dpi resolution on an external monitor with any size. I am using the switch resx app for the same. I am using my 19201080 LG monitor. I have another monitor with 34401440 which runs with hidpi at 2048 * 858. Yes, we have to lose some resolution when we use non-retina monitors for hidpi resolution. But With HI dpi screen will become crisp and usable. Give it a try.
novashivam
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