Xyz probe can the datum be changed?

I've always used bottom right corner for my datum point. I tried the zooen builds xyz probe and by default its the bottom left. Is there a way to change it permantly?
I don't really want to measure each piece of work and set an offset each time just a simple pick a datum position and thats it.

 

Thanks yes I tried that, but then it asks for stock measurements of the material so it can put an offset? Do you have to do that everytime?

 

Thanks I will start using the bottom left from now and treat it as the norm