--- a/eric6/UI/SymbolsWidget.py Wed Jan 08 18:57:10 2020 +0100 +++ b/eric6/UI/SymbolsWidget.py Wed Jan 08 18:58:31 2020 +0100 @@ -504,7 +504,10 @@ self.symbolsTable.horizontalHeader().setSectionResizeMode( QHeaderView.Fixed) fm = self.fontMetrics() - em = fm.width("M") + try: + em = fm.horizontalAdvance("M") + except AttributeError: + em = fm.width("M") self.symbolsTable.horizontalHeader().resizeSection(0, em * 5) self.symbolsTable.horizontalHeader().resizeSection(1, em * 5) self.symbolsTable.horizontalHeader().resizeSection(2, em * 6)