sqlplus column format

Hello,

When we query vıa sqlplus, records are not readable due to the big column format.

setting smaller value  is a  way to overcome this.

However, when we have many columns, doing this one by one for each columns is tedious.

İs there way or a command setting all column format to a certaiın value ?

SQL> select * from SA$LEVELS;

      POL#     LEVEL# CODE

---------- ---------- ------------------------------

NAME

--------------------------------------------------------------------------------

         0       1000 DEFAULT

DEFAULT

column code format a40

      POL#     LEVEL# CODE                                     NAME

---------- ---------- ---------------------------------------- ----------------------------------------

         0       1000 DEFAULT                                  DEFAULT