Mac thinks external Dell display is a built-in display


so have macbook pro running os 10.11 1 additional dell display. christmas received dell display, i'm having issues mac thinking new display "built-in" display. when bring display preference, shows old dell display dell e2414h, new dell display showing built-in display. both displays same, difference being how connected. older display connected via display port adaptor connecting via vga, while new display connected usb 2.0 adapter connected via vga. since new display being recognized built-in display, resolution fuzzy , task bar outside of screen. when @ resolution settings , view scaled options, set 1920x1080 ( should be).

when open mac menu, shows have 2 additional displays, says new 1 30.5 inches ( 24 inches, other display). i'm assuming since macbook thinks display larger is, causing bad resolution. there way fix this? how forced macbook recognize display is?
 



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