To create mass as large as the size of the section box you are viewing

I don’t know if this is possible, so I ask you a question first.
Is there a way to make the section box size mass that I am currently looking at?

I wonder if there is a way to calculate the quantity of objects in the mass by making a mass of section box size.

I’d appreciate it if you could answer.


Thank you very much. Thanks to you, I’m learning and getting to know you again.