I can't import or export a list : the file explorer don't spawn so i can't use this feature. Also a second “hide” appear below the first. I tried on the app but I have the same problem.
Thanks to reply

Please

Please press the globe icon so we can see your browser and operating system

Please note that pressing “export” isn't supposed to open the file explorer.

Having two hide buttons does sound pretty weird, though.
_

Exporting a list isn't supposed to open a file explorer, it just downloads the file to wherever your browser's default file download location is (typically the folder called “Downloads” at a file path that's something like rootFileSystem/users/yourusername/Downloads)