It is strange that it does not store the new resolution values. Try the following, see if we can fix it:
- When you have entered the values for width and height, click on any other input. This is to force the focus out of the resolution input, thus making it update the settings value. Then exit the program and launch it again.
- If you still see no change, while the editor is not running, open the "My documents/HPL2/LevelEditor.cfg" file with a text editor, and change the Width and Height values in the Screen tag. If you want it to more or less cover your entire screen, you should make it look like the following:
<Screen Width="1920" Height="1100" Fullscreen="" TexQuality="0" />
You can tweak the height value so it doesn't go under the lower bar. This last trick should definitely work