how to make my screen back to original size

[TRJ]

My cat layed on my laptop and must of hit something. Now my computer screen
and all the windows that I open are enlarged and I cannot figure out how to
make them back to there original size. It is like everything is magnified.
Any help please?

 

[Mark L. Ferguson]

Control panel, Personalizations, click 'Display Settings', move the slider
where you want it.