The Refresh Table is very useful, particularly after you have saved a Project, then want to refresh the data from the source, without losing any settings.

For example, in your project you had created a Cleaning Matrix and also a Match Definition, and since then, there had been changes to the source data. So rather than lose all the settings by re-importing the latest data file, you can simply click Refresh Table and this will automatically bring in the latest data and none of your settings will be lost.