【求助】tolerance setting problem. Help!!!

When I was creating the features, the default tolerance mode was limit. Now I finish the whole part and create the drawing of the part. I change the tolerance mode to Nominal in the config.pro file. And from utilities/optioins/..., I can see the changed setup. But the tolerance showed on the drawing does not change the format.  
  
And after I change the config.pro, the tolerance mode of new part is changed. How can I changed the old ones?

Please follow up :
  
Menu--->Format-->Decimal Place-->Enter Value-->ick Many ....-->Done

修改config里的tol_mode只會對new part起作用的
在舊的drawing文件里可以一次選擇多個尺寸然后右鍵--properties在彈出的菜單中改tolerance mode為normal就行了
如果該選項是灰色的﹐則改drawing setup里的tol_display為yes同時還要該

thanks!