Undo history limit

Set the number of in-memory model checkpoints retained for Undo. Undo history is not a substitute for saving a file or version.

Where to find it

Settings → Resources

How to use it

Review the current value in Settings before changing it. New defaults do not overwrite values already saved on existing model features.

Result

Initial value: 100. Rebuild or rerun the affected operation when its inputs change.

Troubleshooting

Use Automatic or auto only where offered. Before increasing resource limits, check available memory and disk space; a larger limit does not improve numerical accuracy.