HiDPI on external monitor vs internal

Im using Big Sur on a T440p with Opencore, my main display its an external monitor PHILIPS 234CL ( 1920x1080), the laptop display its 1920x1080 too.
im using this script (which is super easy and i higly recommend) to use HiDPI on my displays.

The issue is i can get HiDPI on the laptop display, but not on the external one.
As you can see on the left one (external monitor) i can just change the resolution, on the right one (internal display) i can change the text size.

Is there anyway i can be able to change text size also on external display?

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https://preview.redd.it/nso2gvbtt3861.png?width=1499&format=png&auto=webp&s=45760808fbe8dd2cfe712fc293e5f754cf3344fc