DTM display from plublished geometry

When we create Dtm planes, it's possible to dispay them as small as we want.

But, when they are comming from a "copy gemometry", it's seems to be not possible.

How can we reduce their size ?

I have a lot of them, and would like them to be dispayed, bu smaller.

Is it possible ?
I assume it's not a crucial problem.
But if there is a manner to manage this...
Thanks