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@dmgeo @qgis It's a know issues with some work-arounds listed here gis.stackexchange.com/questions/291401/map-display-not-filling-window-in-qgis-on-mac
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@dmgeo @qgis Please consider supporting the Mac OS X Bug Fixing Campaign: blog.qgis.org/2018/09/12/macosx-specific-bug-fixing-campaign/