I have a rdlc report that conains a tablix, nothing other. The Tablix expands in horizontal direction to show days and in the vertical direction to show groups.
The tabl
The best way to solved this problem is, for example for an A4 page where
Width=21 cm
and Height=29.7 cm
Now Margin Left=1 cm
and Right=1 cm
so you are having a usable width of 19 cm.
When you have understand this basic calculation that means your problem is solved. You can set up the report page size properties by right clicking on the report property => pagesetup.