if your columns fill all screen just set table width=100% and finish.

but if columns is low, set table width=100% and two way:

1. set with of one of columns=100%

   col1, col2, col3, col4=100%, col5, col6, col7

2. add an empty column at end of header and detail, then set its width=100%

   col1, col2, col3, col4, col5, col6, col7, col8=100%