How to automatically increase page size in exportgraphics?

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I have the following code, which creates the attached image:

                f = figure('visible','off');        
                t = tiledlayout(1,2,'Padding','none','TileSpacing','compact');
                t.Units = 'centimeters';
                t.OuterPosition = [0.1 0.1 22 9];
                nexttile;
                heatmap(denormPrimaryGrid,denormSecondaryGrid,gridProbs,...
                    'CellLabelColor','none',...
                    'Colormap',flipud(redgreencmap));
                ax = gca;
                ax.FontSize = 5;
                
                nexttile;
                heatmap(denormPrimaryGrid,denormSecondaryGrid,gridProbs,...
                    'CellLabelColor','none');
                ax = gca;
                ax.FontSize = 5;
                exportgraphics(t,'orig.pdf','BackgroundColor','none','ContentType','vector');

I'd like to enlarge this a bit, so make the following code changes and re-export. But matlab refuses to change the size and just chops off left side:

                f = figure('visible','off');        
                t = tiledlayout(1,2,'Padding','none','TileSpacing','compact');
                t.Units = 'centimeters';
                t.OuterPosition = [0.1 0.1 27 12];
                nexttile;
                heatmap(denormPrimaryGrid,denormSecondaryGrid,gridProbs,...
                    'CellLabelColor','none',...
                    'Colormap',flipud(redgreencmap));
                ax = gca;
                ax.FontSize = 5;
                
                nexttile;
                heatmap(denormPrimaryGrid,denormSecondaryGrid,gridProbs,...
                    'CellLabelColor','none');
                ax = gca;
                ax.FontSize = 5;
                exportgraphics(t,'orig.pdf','BackgroundColor','none','ContentType','vector');