Can't find the PDF viewer

If you have lost your split screen or can not see the pdf window there are 2 ways it could have happened

PDF viewer has been minimized

The PDF viewer can be minimized by clicking the right arrow on the divider between the editor and the PDF viewer. To retrieve split screen mode, simple click on the arrow again as shown below

Single page view selected

Another way in which the PDF viewer can be lost is if we leave split screen mode, and enter into a full screen text editor mode.

To retrieve the PDF viewer, click on `PDF' in the left hand file menu:

or to return to the split screen mode directly, click on the split screen icon in the top right as shown below.