Just searched a lot in Options but unsuccessful. Can you help me I am probably blind. Thank you
History steps? Do you mean number of undos?
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Mitch! Yes - thank you!
OK, well, up to version 5, there were two settings in Options>General -
- minimum number of undos
and - maximum memory to allocate to the undo stack.
In version 6, the minimum number of undos setting was removed, leaving just the memory allocation.
This was done because even 1 undo could run you out of undo memory if it was some massive operation.
So the advice is now to give Rhino undos the max available memory (RAM) you can afford - these days easily 1Gb - if you have a lot of RAM, you can probably give it more.