How can I redo / reset the "Train / Test Split"?

Hi, I´ve added audio samples after the first Train/Test Split - and get a warning now - good - how can I reset the split to do it again in the same project to get 80/20 from all data incl. the new samples? Regards Roland

PS: OK, I´ve found the manual way to select & move files to the test data set - but how could I redo to automated / random split again?

In the Dashboard menu under Danger zone is Perform train/test split. “This splits all your data automatically between the training and testing set, and resets the categories for all data. This is irrevocable!”