Changing text size or size of your screen image

To increase or decrease the screen image, just press the control button and simultaneously press the plus (+) or minus (-) buttons to increase or decrease the image size.

If you have a mouse with a scroll button you can increase/decrease the size of your screen image or text, by pressing Control and using the scroll button to increase or decrease size.

You should be able to get a full screen (without all the toolbars etc) on any Windows computer by selecting function key F11.  You can return to the normal screen again by just pressing F11.