HT1338 Since having my Macbook Pro attached to a large display screen, everything is too large for the screen. Is there a cure please?

Today I had my Mac linked to a projector screen, and since disconnection evrything from the desk top onwards has been too large for the screen. Before that evrything was perfect. I have tried zoom buttons etc, but nothing seems to work. Any help gratefully rceived.

So it's not the Zoom feature?  Open System Preferences Universal Access pane Seeing tab.  Make sure Zoom is turned OFF.
If it's not that, then you may have the resolution set so that it is not optimal for the built-in display.  Open System Preferences Displays pane Display tab.  The optimal resolution is usually the one at the top of the list of choices.

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