How to change the lable size a/c to papaer size automatically

Hi

currently the label size is 32 ad the paper size also i took as 32 so when i am using 32 paper in printer for prining it its printing fine but when i am using 64 paper size in printer for printing the label its printing very small and at the corner can anyone please tell me how i can print same in 64 paper i mean to lable size shouls not decreased while printing in 64 size papaer