The CONTENTSIZE= attribute determines what percentage of the frame file is used for the table of contents. Specify this attribute within the style element Frame. You can also reduce the fonts so that the table is smaller. View output.

   proc template;
     define style styles.test;
     parent=styles.default;
       style Frame from Document /
             contentposition = L
             bodyscrollbar = auto
             bodysize = *
             contentscrollbar = auto
             contentsize = 5%
             framespacing = 1
             frameborderwidth = 4
             frameborder = on;
     end;
   run;

See also the full PROC TEMPLATE FAQ and Concepts.

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