[Plugin: Shortcode Exec PHP] Editor on the iPad

I found out that this is only a minor problem with a simple workaround.
Pushing the screen bottom expands the editor window to a comfortable larger size. However, I did not find a way to shrink the window back to small size. On my PC I click the screen bottom again but that does not work on iPad. If I now want to test my code then the editor window is shrinked vertically very, very slowly. Horizontally it keeps the larger size. Waiting long enough one gets the window with the test results.
So my best way to work with the editor on iPad is not to use the enlarged editor window.