Select Undo or Ctrl+Z to undo the last change or command when editing data or the job file (View|Job File).
Alternatively, you can right-click and select Undo. The right-click context menu Undo is only applicable for cell-level editing on the data grid when a variable type data file (ASCII CSV delimited (*.csv), ASCII tab delimited (*.tab, *.tsv), MS Excel (*.xls, *.xlsx, *.xlsm) or SPSS (*.sav)) is opened in edit mode or for an ASCII fixed (*) data file opened in edit mode.
Variable type data files are opened in edit mode by default. ASCII fixed (*) data files are opened in read-only mode by default.
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