Is it possible to define a specific size of graph in order to get all the graphs with the same size when copying them into a document ?
not yet.please vote:Functionality to generate Plots with specific Plot Size
You can set the size() of the graph to what you want. Save the script of the graph to the script window and edit the size to what you want and run the script.
Graph Builder( Size( 800, 600 ), Show Control Panel( 0 ), Variables( X( :Weight ), Y( :Thickness ) ), Elements( Points( X, Y, Legend( 3 ) ) ) );
which Size?https://community.jmp.com/t5/Discussions/Graph-builder-Frame-size-JSL/m-p/702694/highlight/true#M88706
Thanks, I will try your solution.