Double Screen

[420benz]

As you can see when I open a site that site opens in a half page.don't know how to fix it.Thanks

 

[Stephen.R]

.. you have two windows open there. If you want the window to take the full width of the display without using "Full Screen mode" (where the menubar and dock are also hidden) hold down the Option key and click the green 'Zoom' button in the top left of each window. Or just resize them manually by dragging the edge to the side of the display.