Everything LARGE

If someone could kindly help me i have just recently purchased a computer with very little knowledge about them. I have some how seem to have changed the size of everything on the screen to be extra large therefore you cannot see the a third of most of the screens. I have tried to change the size of everything through control panel then appearances but you cannot see the bottom of the screen to click "apply" or "ok ". Any help will be kindly appreciated.

Thankyou
Daniel

 

If you just need a bit more space, right-click the taskbar, Properties, and set the taskbar to autohide. Drag the display settings window up as high as you can to see if you get the buttons.

If you can see the slider on the Settings page in Display Properties, move it to where you want it and hit <Enter>.