External Monitor display issue

The external monitor for my mac book pro displays large/wide text when both screens are open.  If I shut the laptop, the external monitor display returns to a normal view.  I tried going to system preferences, displays and it's either on best for display or in scaled, the maximum 1920 x 1080.
Please advise.

Where is extended display mode? In display screen, the mirrored mode is checked, both displays are in 1920 x 1080, not sure what else I can do here?  BTW: it just started happening (all was normal on both screens) until I used laptop at my work and connected it to external screen (school) with VGA adaptor (at home I use a DVI).

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