How do I adjust the water level in the toilet bowl itself? With flushing there is a gush of water that actually flies forward and onto the floor, not really ideal. I think it's because the level of water inside the bowl is too low but I have no idea how to adjust this…a more traditional toilet, no problem, but this one it too high tech for me!
Water – How to adjust the water level in a Grohe inner wall toilet
leveltoiletwater
Related Solutions
We had a similar problem with our Duravit toilet. We followed the instructions above, and after pulling out both the intake water controller portion, as well as the flush control, he didn't find any calcium build-up: just some rust stains. 
As a final check, my husband reached down into the toilet tank and felt something stuck in the bottom stopper valve. He felt what he thought was a broken piece of rubber, and after tugging on it with some force, he pulled the foreign object out in his hand from the access hole in the wall, and found a perfectly intact, but dead scorpion
]2 It must have died just that morning when the toilet started running. Luckily he wasn't stung.
It looks like you are missing your fill hose. There should be a hose connecting the outlet at the top of your fill valve assembly running into your overflow tube:
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Best Answer
The geometry of the toilet bowl itself determines the water level, so it’s not adjustable. Try adding water with a bucket and you will see the surface area return to where it was designed to be. The flush action is designed to get as much force out of the six liters of water as possible, so there will be turbulence. I recommend closing the lid before flushing. With European toilets, it seems to be a matter of us adapting to them.