You can change the width of the characteristic and key figure columns.
Characteristics Column
To change the width of the characteristic column, proceed as follows:
Key Figures Column
To change the width of the key figure columns, proceed as follows:

An output length is stored in the ABAP/4 Dictionary for every key figure. If you select a column width which is larger than the length of a key figure, the system will ignore your entry and will show this key figure in the output length.