To minimize and restore columns:
To minimize a column, double-click its heading, or right-click and select Minimize.
To return a column to its original width, double-click a minimized column heading, or right-click and select Restore.
To restore all minimized columns to original widths, right-click a column heading and select Restore All.
Planning saves column widths for each dimension independently. Column widths are saved for the duration of the session when you add, edit, or delete a dimension member, or when you select another dimension.