How to unlink computer from Photos app

I have several Windows 8 installations with the same Microsoft account.
The Photo App seems to merge all Picture folders of my account.
I want to unlink computers though, as one computer contains files which shouldn't be able to be seen by anyone using the other computer. Even when that first computer is offline, all these pictures can be viewed, even though I can't find copies anywhere on the other computer.
Does anyone know how to do this, without moving those files into a different folder altogether?

You have HomeGroup sharing enabled. Go to PC Settings, and click on HomeGroup, then set Pictures to Not Shared.

It was set to don't share in the first place, and I left the home group too now, but that picture folder with the name of that other computer, including all pictures, are still showing up. They must be stored somewhere, but a search of the files names doesn't come up with anything.

naujoks said:

It was set to don't share in the first place, and I left the home group too now, but that picture folder with the name of that other computer, including all pictures, are still showing up. They must be stored somewhere, but a search of the files names doesn't come up with anything.

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Are you using Windows Sky Drive integration?