Description
The Undo function doesn’t work for Automatic UV generation.
Solution
The Automatic UV generation doesn’t support the Undo function as the process also involves tessellation which can’t be undone reliably. As a workaround you can either choose one of the other unwrapping methods or save your scene before using Automatic unwrapping and reload it if necessary.
Article information
KB Article ID:
#5601
Support Reference:
DG-27667, DOC-1251