The Data Preview window contains a small sample of data (200 records) from each dataset you have imported.

Simply click the dataset name (the tabs at the top of the Data Preview window) to switch the Statistics and Matrix views between the datasets you currently have loaded.

When you make changes on the Matrix, you will instantly see the changes on the data preview window, but if you un-tick, then the changes will be undone.


See example below, notice the commas within the "Company Name" column:



On the Matrix, against the Company Name column, tick the "Comma", as shown below:



Note immediately on the data preview that all commas within the "Company Name" columns are removed:



Go back onto the Matrix and un-tick the comma option as shown below:


Notice now the commas have returned. If we wanted to process the entire dataset, we could have clicked Run Clean.