How do I hide columns with sensitive data or come?

I would like to hide columns of data and the hide button does not appear to work?

Welcome Dean,
The 'hide' option in each column's configuration relates to the 'Date in cell' feature, explained here in detail .
It isn't possible to hide columns with the current version , but with our next upcoming update you'll be able to represent the same column along different tabs and this will allow you to create some kind of summary tab with only a selection of columns as a similar alternative to hiding a column.

Thanks for contacting us

PS: Hiding columns is in our roadmap , but it will take some time....