When FlexPDE completes the solution of the current problem, it will leave the displays requested in the PLOTS section of the descriptor displayed on the screen.
At this point you have several options:
Edit or Save the Script
Click "Controls|Show Editor" (or the 
Tool) to switch the display into Edit mode, allowing you to change the problem and run again.
From Edit mode, you can click "Controls|Show Plots" (or the 
Tool) to redisplay the plots.
You can also click "File|Save" (or the 
Tool) to save the file, "File|Save_As" to save with a new name, or "File|Close" to close the problem.
Switch to Another Problem
Each currently open problem is represented by a named tab on the tab bar. You can switch back and forth among open problems by selecting any tab.
Open a New File
Click "File|Open" (or the 
Tool) to open another problem script without closing the current problem.