I used to be able to do this quite easily in Rhino for windows, but can’t seem to find the option in the Mac version of Rhino.
Hi chernwern - as far as I can see this is not possible in Rhino for Mac, but I’m not sure if it is some hard coded amount in Rhino or if clever apple handles it completely differently.
Setting the undo stack size could be necessary when running 32 bit Widows Rhino, when the user has to sometimes manually manage memory allocation. Mac Rhino is only a 64 bit application and does not have the same memory constraints.
What is the problem you are trying to solve?