Tried the app, but I'm already stuck. I cannot go back to the tables after the tutorial, but I can go to the breakroom and back to the kitchenwindow. Just downloaded and installed the app for fun on my phone.
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An update to my situation. I found out that there is somehow a problem because of multiple inputs and wrong sequences.
Whenever I press and hold with my finger on the down arrow (at the kitchenwindow) the arrow disappears. When I then move my finger around, the arrow starts to flicker, like it gets multiple inputs. The good thing about that is, that sometimes it brings me to the tables screen.
Now the wrong sequences guess is, because only the kitchenwindow arrow disappears. The tables and breakroom arrow glow up yellow when pressed and move to the other location after release.