Change the size of the heated bed  

Change the size of the heated bed

Hi. every one.

I currently own a Prusa I3 MK2. I had a problem with my heated bed. The nozzle is returned to the bed and the thermal resistances have been damaged. So I had to change the bed. The only one I found is slightly smaller than the original. The problem is that, at the beginning of printing, during the calibration, the nozzle tries to calibrate itself outside the bed since the new one is smaller. It is therefore impossible to calibrate and make impressions. It should either change the bed size in the software of the printer (I do not know if this is possible) or remove the automatic calibration before each print.

Here is the new bed I bought :
https://shop.prusa3d.com/en/electronics/48-heated-bed-mk2b.html
New size are 200x200 mm and before I change I had 25 x 21 cm. (I could fix it without worries, the points of attachment had the good dimensions.)

Any idea to help me ?
Thanks.