Is this a serious question ?. If so try going to the main desktop menu, to a blank part of the screen, right click, select properties- select settings- and alter your screen resolution from 800x600 to 1024x768 or visa versa.
Get an extension lead for your keyboard and then sit as far away from your monitor as you can. Hey presto those annoying large Icons and text now seem so much smaller. Or if you've got a pair of binoculars hold them to your eyes the wrong way round, this will instantly make the screen appear smaller. Hope this helps.