The main workbench serve as startup panel. It is opened automatically when GroIMP is started (even in UI without display). It was gray on older version of GroIMP, and is white with sections on newer versions. The main workbench remains “open” at all time as long as GroIMP is opened. When an other workbench is opened, the main workbench becomes “hidden”. It is visible again, when all other workbench are closed.