In Pharo 1.4, if your Display is not tiny, the initial extent of the debugger is 2/3 the width and 4/5 the height of Display. For large screens, this is just too big, especially too wide. My current Display is 2396x1741x32, and I have to immediately resize any debugger smaller in order to make it usable. I've experimented with leaving the height as is and limiting the width to 900 in Debugger>>initialExtent; this produces a much more usable result. ((w - (w // 3)) min: 900) @ (h - (h // 5)) The debugger also always centers its window in Display. Since my Display is spread across two monitors, this means it always must be moved to be readable. If I comment out the line window center: Display center. in MorphicUIManager>>openDebugger:fullMorphicLabel:, I'm much happier. I'd think these changes might be desirable for everyone -- comments? Regards, -Martin