UI dissapeared

Suddenly the bottom part of the UI seems to be vainishing or mouseover or something and I tried looking through the forums etc that says to press alt & - etc and I pressed every key I have together with the alt key and nothing puts the UI back to "normal" I have a Swedish keyboard, can anyone help me get this figured out?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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