Lost bibliography? Help wanted!

I just started working with Zotero on Mac (10.13.6) and had added around 10 items.
The I clicked "New collection" (I'm working with the program in German) - and since then all my bibliography is gone.
In my account, all items still exist, but not in the program. Anyway the surface looks different to the surfaces I find in tutorials.
Anybody familiar with this problem?
I would highly appreciate any support!
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