Hi Stefano, there are some settings in moi.ini for undo, you can reach these by using Options > General > "Edit .ini file" button:
[Undo]
MaxMemorySizeMB=20
MinNumberOfUndos=10
The way it works is that it should keep at least the "MinNumberOfUndos", and it will keep more than that if the objects in the undo stack consume leess than "MaxMemorySizeMB" numbef of Megabytes.
Can you maybe describe a little more about what you're doing when you see the undo that's limited to only 2 or 3 steps? If you see it with a particular model can you please post the .3dm model file so I can test with it over here?
Thanks,
- Michael
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