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When you assign a girl to the barn, the eye goes right next to the "change" button. That's also where it is for the auditorium and nightclub.

If the eye button doesn't appear, that means that particular girl doesn't have a scene for that particular location yet.

Here's a screenshot from my game, for reference:

So if you're using the latest version, which is 0.48, it seems you've got a bug.

(Seems I also have a bug, in that the countdown meter doesn't appear.)

Perhaps the functions are still there, but not visible. Maybe try clicking where the eye button should be?

Also, HypnoChanger seems to have forgotten to update the version count in the latest version. So even though the version actually is 0.48, the title screen says it's 0.47, so keep that in mind.