As everyone has already said above, you have to set the depth manually.
Not sure about RUB, but in GWX a type VII usually runs at a depth of 5 meters when surfaced. If you set the depth to 6 meters you will run with decks slightly awash. Your speed and fuel efficiency will drop to about 82% of normal, but you will be harder to see and can still man the deck gun. You can also set the depth to 7 meters to run with the decks heavily awash (pretty much just the conning tower out of the water). Your speed and fuel efficiency will drop to about 75% of normal, but you are even more difficult to spot.
If you look in the \data\Submarine\NSS_Uboat7b\NSS_Uboat7b.cfg (or whatever type of sub you have) file under [PROPERTIES] SurfaceDepth= you can see at what depth the game will consider you "underwater".
RUB is getting a little old, so I would second Corsair's suggestion that you try one of the newer supermods GWX, NYGM or WAC.
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