FYI – The current beta (and next version of DG) have a new option for hiding multiple columns at once. Highlight the columns, click the gear menu in the top left corner of the data table, and use ‘Hide Selected Columns’.
We are also thinking about adding a right-click on an individual column in the data table to hide. Then you don’t need to open the data definitions to hide data, but you would need to open to unhide.