To hide a field, you click the arrow in the field header and select hide. To unhide it, you’re supposed to use the “Options” menu where you can see a full list of your fields and hide, unhide, and reorder them. This works fine with Asana in a browser. In the PC desktop app, there is no scroll bar. If you have more than (however many fields fill your screen), you can’t see the ones at the bottom, whether or not they’re hidden. If I hide a field and save the view, I have to open Asana in a browser to get it back.