I've already tried that. When I try to decrease the size there's a Microsoft Excel message which says this:
"L'affichage de la mise en forme complexe appliqué au graphique sélectionné risque de prendre du temps. Voulez-vous continuer à utiliser la mise en forme ?"
Which could be roughly translated in English by:
"The display of complex formatting applied to the selected chart/graph may take some time. Do you want to continue using the formatting?"
And then when I click on "Yes" and decrease the size it does nothing.


PS: I've tried to change the language in Excel to English but it doesn't work...