Alter a View or Table by double-clicking it from the Schema Browser, editing it, then clicking the close box ('X') for the editor.
TOAD asks, 'Exit without saving?' (Yes/No).
It doesn't matter whether you click 'Yes' or No', it closes the editor without saving.
WORKAROUND
To save changes, click 'OK'
To exit without saving click 'Cancel'
STATUS
Waiting for fix in a future release of Toad for Oracle