In PSE 11 Editor, the original grey editing background screen was grey. Now when I open a file, it is white. I know I must have changed the default color somehow but now I want to revert to the original grey colour. How do I revert to the original?
Close all the images. Right click on the white workspace, select color as per your choice. If you would like to revert to default settings try Edit->Preferences and click ok Reset Preferences button. Quit Editor and launch again.