OSX: I used to have a disk eject button in Finder - How do I get that back???

MrSmith

I'm sure this is a simple Settings checkbox, but I can't find it anywhere.
Right now, if I'm finished using my encrypted folder and want to make it inaccessible again, I have to quit Boxcryptor.

I swear when I first installed it, I could mount and unmount the drive and use my PIN each time.
Sorry if this is uber-noob, but I've tried RTFM and search and I'm still at a loss

Any help gratefully received.