@Caliaxy, this instrument is much better described as an analog scope (notice for example the "alt" and "chop" dual trace modes), with a digital storage mode. One usually operates it in analog mode since it has a bandwidth of 100MHz, but only 20MS/s. Thus, in digital storage mode, it is usable only to 5MHz or so for non-repetitive signals.
Also, it's mainly controlled like an analog scope, and its menu system is far from the ones normally found in digital scopes. I doubt if there is a "default setup" option anywhere.
@raphrath, did you try the scope in storage mode? do the position knobs control the trace correctly in this mode?
Does the trace extend from left to right in storage mode + roll mode (timebase settings <= 0.2s/DIV)?