Hi Jonathan,
I understand that you would like to customize the color appearing in the legend. You can try changing the color by changing the "bh(2).FaceColor". You can try the following code:
%modifié
X=categorical({'small','medium','large'});
X=reordercats(X,{'small','medium','large'});
Y=[5 18 56];
TestL={'Mon','Tue','Wed'};
figure()
b=bar(X,Y);
hold on
b.FaceColor = 'flat';
b.CData(1,:)=[1 0 0];
%b.CData(2,:)=[0 1 0];
b.CData(2,:)=[0.4940 0.1840 0.5560];
b.CData(3,:)=[0 0 1];
bh(1) = bar(nan,nan,'r');
bh(2) = bar([nan,nan]);%
bh(3) = bar(nan,nan,'b');
bh(2).FaceColor=[0.4940 0.1840 0.5560];
legend(bh, TestL, 'location', 'best') %'northwest'
%legent at the top
xtips1 = b(1).XEndPoints;
ytips1 = b(1).YEndPoints;
labels1 = string(b(1).YData);
text(xtips1,ytips1,labels1,'HorizontalAlignment','center',...
'VerticalAlignment','bottom')
ylabel('Energie [kWh]')
Hope this resolves your issue!
