I zoomed in too far

Okay, so I zoomed in a little too much and then created some objects. I confess: I'm guilty. I'm sorry.

Now I want to undo my sins. Alas, I can't delete the concerned objects anymore, because (according to Prezi) they are too small. They are stuck in a dimension that is a few zooms too far!

I'm annoyed, because I constantly see those tiny objects without even being able to delete them.

Can you guys help me with this issue?