You experience this issue, if the screen resolution is too low and the Close button is on the bottom.
To resolev this issue, you will need o increase the resolution. Do the following;
- Click Apple.
- Click System Preferences.
- Open Display.
- Change to a higher resolution. eg, change to 1280×800 or 1680×1050. Note: The highest resolution depends on what your monitor supports. Some monitors are only capable of displaying 1024X768.
- Close the window.