Column labels in the browse are left-justified by default. You can use the C, L, and R options (Center, Left, Right) of the LABEL attribute to modify the justification of column labels. For example:

DEFINE BROWSE CustBrowse QUERY CustQuery DISPLAY
  CustNum LABEL "Cust. No.":C
  Name WITH 10 DOWN.

Note the colon (:) syntax. To use this option, you must attach the justification option to the end of the LABEL option. So, even if you want to use the default labels, you need to re-enter them here in order to append the justification option.