Hide Field in form if another field = "Purchase"

[3dDom]

Hi,

I'm new to AppSheet. It's great - what I have needed for several years now.

I've built a form and am now I'm struggling to create a formula to reveal a field dependent on another field's value. The below is the problem. The three date fields should be hidden. If I choose "Hire" in the field above, the first two date fields should appear. If I choose "Purchase" the last date field should appear. Can anyone suggest how I do this? (I am assuming this is possible!).

Thank you,

Dom