Using a QSplitter make the width of the mini map (height scales accordingly) adjustable by reducing or increasing the width of the main map in the editor and main game screen. Make the width permanent as a preference (which is not set in the preferences dialog) with some limits and a meaningful default value (like 300px).
Using a QSplitter make the width of the mini map (height scales accordingly) adjustable by reducing or increasing the width of the main map in the editor and main game screen. Make the width permanent as a preference (which is not set in the preferences dialog) with some limits and a meaningful default value (like 300px).