Hide Objects layers question.

When I hide an object in the Scene Outliner and then I move an shown object in the viewport all the hidden object reappear and I have to hide them again.
I was wondering how I keep them hidden where I work on area in the level. Like a layer. Sorry for the bad english and easy question and I just started to learn unreal 4. I have searched for it online and no luck.
Thanks for anyone helping me out. take care

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